The following are the messages from Mike's moments (朋友圈) on WeChat during the trip to Beijing.

    Today is July 5, my birthday, the first day of our trip. It's 2:30 p. m. I'm riding a bike with my parents and my little brother Bob in Beihai Park. We are singing, listening to birds, and having a lot of fun.

    Today is July 6. It's the second day of our trip. We plan to visit the Great Wall. There area lot of people along the way. I feel a little tired, but I'm happy! While we are climbing the mountain, I talk about my future (将来的) job with my parents. What do I want to be? Ha! Maybe a teacher or a singer.

    My parents are visiting their old friend, a famous writer, at her place. I am having lunch with Bob and watching a show in Deyunshe. The food isn't so delicious but the show ... Well, it's so humorous and interesting. I really like it.

    It is the fourth day of our trip. We're going back home at 6:00 p. m. It's 10:00 a m. now. We are visiting the famous Chocolate Factory and making chocolate by ourselves happily. We are really having a great time here! Sweet Kiwi! I love you!

It was a February afternoon. We were in a classroom. Taylor Angler watched some ducks swimming on a farm. But it was all in her head. A virtual reality headset (虚拟现实头戴式显示设备) took her there. "I was surprised to find that the ducks were right in front of me! It was an exciting experience (经历)." Taylor said after taking off the purple headset and finding herself still in the classroom. Many students around the world are taking VR "trips" like Taylor. But what change does it cause in learning? 

Taking children to visit different places is a good way to teach them about the world. But what can children do if they forget it after the trip? VR lets children go back at any time. 

It's difficult to talk about something if you didn't see it with your own eyes in the past. If you didn't see the ocean, with VR, now you can have a look at it for yourself. 

VR can also help students in science classes at school. "Too often at school, when you do experiments (实验), you put different kinds of chemicals together and then get the result. And if you aren't successful, you need to do it again, " a high school teacher said. "But we don't have enough chemicals. With VR, I just need to do it again on the computer. I don't have to use chemicals."

VR is useful, but that's not to say we don't need real-world experiences. The real world is what we really need to learn about.

Once or twice, there was crying and sighing (叹息) from a little leaf, as leaves often do when the wind is blowing. The tree said, "What's the matter, little leaf ?"

"The wind, " said the leaf, "just told me that one day it would pull me off and throw me on the ground. "

" Don't be afraid, " the tree said. "Hold on , and you shall not go off until you are ready. "

So the leaf stopped sighing and went on singing. It grew all summer long until October. When the bright days of autumn came, the leaf saw all the leaves around growing very beautiful. Some were yellow, some were brown, and many were colorful. Then the leaf asked the tree what this meant (意味着).

The tree said, " All these leaves are getting ready to fly away, and they have put on these colors because of their joy (快乐). "

The little leaf started to want to go and grew colorful thinking of it. Then it saw that the branches (树枝) of the tree had no bright colors on them and asked why.

"We must keep on our working clothes because we don't finish our work, " said the tree, "but your clothes are for holidays because your work is now over. "

Just then, the wind came, and the leaf let go (放手) without thinking. The wind took it up and turned it over and over. Then it fell slowly down on the ground, among hundreds of leaves.