在利用火箭升入太空之前，太空飞船二号还将进行一系列的滑翔飞行。
SpaceShipTwo will make a series of additional glide flights before rocketing to space.
信天翁是滑翔飞行的鸟类之王，它能自如地驾驭空气，但必须顺气流飞行。
The albatross is the king of the gliders, the class of fliers which harness the air to their purpose, but must yield to its opposition.
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。
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.
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