相反，我是猛地向后倒去，只听砰的一声重响，我跌倒在地。

Instead, I jerked backward, heard a loud pop, and fell.

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本文研究声重波在垂直切变风场中传播时谱结构的改变。

In this paper, the variation of spectral structure of acoustic gravity waves (AGW's) propagating through a region of vertical wind shear is investigated.

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声乐练声曲不仅是一种特殊的音乐体裁形式，更是一类十分重要的声乐演唱训练材料。

Training Tunes are not only a special form of music, but also a very important training material in Vocality.

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