In this section we will discuss how to balance the gravity and fly freely and safely in the sky.
本节我们将讨论怎样平衡地心引力，在空中安全自由地飞翔。
We have 60 satellites in the sky to fly, how many of you.
我们有60棵卫星在天上飞，你们有多少？
One of my French classmates is learning how to pilot the puddle-jumper. He asked me and another friend to join with him to fly in the sky.
我的一个法国同学在学习驾驶小型飞机，他邀请我和另一个同学去乘坐他开的飞机。
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