... diagonal system (混合双打)斜对于角共同打法 frame of racket 拍框 first server (混合双打)熬头次发球员 ...
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frame e of racket 拍框
frame of racketframed of racket 拍框
·2,447,543篇论文数据，部分数据来源于NoteExpress
But the frame of the aircraft itself is to blame for the other half: the bumpy air flow over the undercarriage and the slots and flaps of the wings creates the rest of the racket.
而另一半的元凶则是飞机自身的结构问题：颠簸不平的气流穿梭过往时同起落架、翼缝和襟翼等结构相遇制造了另一半噪音。
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