我们也许可以通过放风筝把对风能的利用扩展到云的高度。
We might extend the application of [wind] power to the heights of the clouds, by means of kites.
当我发布一个许可的时候，我同时敲入航路或高度，然后我收听飞行员的复述，同时我又记下我的指令。
As I issue a clearance I am typing the route or altitude, then as I am listening to the read back I am writing down my instructions.
在条件许可之下，一般都在海拔以上离地面750到1500英尺范围内的均匀高度上飞行。
It is customary to fly , so far as is feasible, at a uniform elevation above sea level but within a range of 750 to 1500 ft above the earth's surface.
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