莱特兄弟是怎样发明飞行器的?请给下列句子排序。{#blank#}1{#/blank#} They watch how the birds fly.
{#blank#}2{#/blank#} They fly like birds.
{#blank#}3{#/blank#} They draw a picture of their flying machine.
{#blank#}4{#/blank#} They want to invent a flying machine.
{#blank#}5{#/blank#} They build the flying machine.
{#blank#}6{#/blank#} Wright brothers like to invents things. One day,they are watching some birds flying in the sky.