If angels used gliding flight, they would need to be exposed to very high wind velocities at take off - such high winds that they would be blown away.

即便天使是采用滑翔飞行的方式，在起飞时也必须暴露在非常强的风速中，而如此强风会将他们吹走，此时翅膀就显得多余了。

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Why would they continue refining the specifications, go to all that trouble for something that, if it was a rocket, would soon be blown into shrapnel when it went off?

CNN: Transcript of Powell's U.N. presentation