1、
2、
The ball has left the frame, but Djokovic is still completing his long follow-through.
球已经击出去了，但是德约科维奇仍然在继续他那长的随后的动作。
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3、
Power angle stability control is still based on the fixed reference frame at present.
目前,功角稳定控制一般还是基于系统固定参考系.
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4、
5、
