无菌性松动是人工关节失效的主要形式，由磨损粒子在植入物与肌肉界面的聚集导致。

Aseptic loosening of the prosthesis is a major form for the failure of artificial joints, which results in the conglomeration of wear particles at the bone-implant interface.

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在非洲这个镇唯一清晰的标志镇是捡垃圾的黑人工作者聚集的地方。

The only clear sign that the town is actually in Africa is the throng of black workers who pick up the trash before it can hit the ground.

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