Transparent animals let light pass through their bodies the same way light passes through a window. These animals typically live between 

the surface of the ocean and a depth of about 3,300 feet—as far as most light can reach. Most of them are extremely delicate and can be 

damaged by a simple touch. Sonke  Johnsen, a scientist in biology, says, “These animals live through their life alone. They never

touch anything unless they're eating it, or unless something is eating them.”

And they are as clear as glass. How does an animal become see-through? It's trickier than you might think.

      The objects around you are visible because they interact with light. Light typically travels in a straight line. But some materials slow and

 scatter(散射) light, bouncing it away from its original path. Others absorb light, stopping it dead in its tracks. Both scattering and absorption

 make an object look different from other objects around it, so you can see it easily.

But a transparent object doesn't absorb or scatter light, at least not very much, Light can pass through it without bending or stopping.

That means a transparent object doesn't look very different from the surrounding air or water. You don't see it —you see the things

behind it.

   To become transparent, an animal needs to keep its body from absorbing or scattering light. Living materials can stop light because they

contain pigments(色素) that absorb specific colors of light. But a transparent animal doesn't have pigments, so its tissues won't absorb

 light. According to  Johnsen, avoiding absorption is actually easy. The real challenge is preventing light from scattering.

Animals are built of many different materials—skin, fat, and more—and light moves through each at a different speed. Every time light

moves into a material with a new speed, it bends and scatters.Transparent animals use different tricks to fight scattering. Some animals are

simply very small or extremely flat. Without much tissue to scatter light, it is easier to be see--through. Others build a large, clear mass of

 non-living jelly-lie(果冻状的)material and spread themselves over it .

    Larger transparent animals have the biggest challenge, because they have to make all the different tissues in their bodies slow down light 

exactly as much as water does. They need to look uniform. But how they're doing it is still unknown. One thing is clear for these larger animals, staying transparent is an active process. When they die, they turn a non-transparent milky white.

    It was an autumn morning shortly after my husband and I moved into our first house. Our children were upstairs unpacking，and I was looking out of the window at my father moving around mysteriously on the front lawn. “What are you doing out there?” I called to him.

    He looked up, smiling. “I'm making you a surprise.” I thought it could be just about anything. When we were kids, he always created something surprising for us. Today, however, Dad would say no more, and caught up in the busyness of our new life , I eventually forgot about his surprise.

    Until one gloomy day the next March when I glanced out of the window，I saw a dot of blue across the yard. I headed outside for a closer look. They were crocuses (番红花）throughout the front lawn — blue, yellow and my favorite pink，with little faces moving up and down in the cold wind. I remembered the things Dad secretly planted last autumn. He knew how the darkness and dullness of winter always got me down. What could have been more perfectly timely to my needs?

    My father's crocuses bloomed each spring for the next five seasons, always bringing the same assurance: Hard times are almost over. Hold on, keep going, and light is coming soon.

    Then a spring came with the usual blooms but the next spring there were none. I missed the crocuses, so I would ask Dad to come over and plant new bulbs (植物球茎). But I never did. He died suddenly one October day. My family were in deep sorrow, leaning on our faith.

    On a spring afternoon four years later, I was driving back when I felt depressed. It was Dad's birthday, and I found myself thinking about him. This was not unusual — my family often talked about him, remembering how he lived up to his faith. Suddenly I slowed as I turned into our driveway. I stopped and stared at the lawn. There on the muddy grass with small piles of melting snow, bravely waving in the wind, was one pink crocus.

    How could a flower bloom from a bulb more than 18 years ago, one that hadn't bloomed in over a decade? But there was the crocus. Tears filled my eyes as I realized its significance.

    Hold on, keep going, and light is coming soon. The pink crocus bloomed for only a day, but it built my faith for a lifetime.

    There's no doubt that our character has a profound effect on our future What we must remember, however, is not merely how powerful character is in influencing our fate, but how powerful we are in shaping our own character and, therefore, our own fate. Character may determine our fate, but character is not determined by fate.

    It's a common mistake to think of character as something that is fully formed and fixed very early in life. It calls to mind old proverbs like "A leopard can't change its spots." and "You can't teach an old dog new tricks."

    This perspective that our character is "etched in stone" is supported by a great deal of modern psychology emphasizing self-acceptance. As Popeye says, "I am what I am." The hidden message is: Don't expect me to be more, better, or different.

    Ultimately (最后), these views of humanity totally undervalue the lifelong potential for growth that comes with the power of reflection and choice.

    How depressing it would be to believe that we can't choose to be better, more honest, more respectful, more responsible, and more caring. None of us should give up the personal seeking to improve our character. Not because we're bad, we don't have to be sick to get better, but because were not as good as we could be.

    There are so many things in life we can't control, whether we' re beautiful or smart, whether we have good parents or bad, whether we grow up with affirmation (肯定) or negation. It's inspiring to remember that nothing but moral will power is needed to make us better.

    No it isn't easy. But if we make a great effort to become more aware of the habits of heart and mind that drive our behavior, we can begin to place new emphasis on our higher values so that we become what we want our children to think we are.

    The China National Opera (CNO) will give a concert to celebrate its 50th birthday.

    Different generations of CNO vocalists, like Li Guangxi, Yao Hong and Ma Mei, will present the concert which will feature both songs from famous Chinese operas like "The White-haired Girl" and "The Hundredth Bride", as well as, arias of such Western opera classics as" Madame Butterfly", " La Traviata" and "Rigoletto".

    Time/ date: 7:30 p.m., September 7th, 8th

    Location: Tianqiao Theatre

    Tel: 6551-4787, 8315-6170

    Tickets: 60-500 yuan (U.S. $7.2- 60.2)

    Folk music

    A concert will be held to feature some recently composed traditional Chinese music works. The concert, given by the Folk Orchestra of the China Opera and Ballet Theatre, will include such pieces as "Memory of Childhood", "Memorial Ceremony for God" and "Wine Song".

    Time/date: 7:30 p.m., September 13th

    Location: Concert hall at the National Library of China

    Tel: 6848 -5462, 6841-9220

    Tickets: 30-200 yuan (U.S. $3.6-24.1)

    Moon music

    A concert of traditional Chinese music will be given on the eve of the Moon Festival which falls on September 21st this year. The concert will feature a number of famous pieces centred on the theme of the moon, such as "Moonlight", "Spring night on a Moonlit River" and "Lofty Mountain and Flowing River."

    A number of established traditional Chinese music performers like Zhou Yaokun and Fan Weiqing, will play solos as well as collaborate with the folk music orchestra.

    Time / date: 7:30 p.m., September 21st

    Location: Grand Theatre of the Cultural Palace of Nationalities

    Tel: 6606-8888, 6606-9999

    Tickets: 40-240 yuan (U.S. $4.8-27)