The bursae act as cushioning to allow smooth gliding between these structures.
滑囊起缓冲作用,以保证两个结构的通畅滑。
The bursae act as cushioning to allow smooth gliding between these structures.
滑囊起缓冲作用,以保证两个结构的通畅滑。
:以上例句、词性分类
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