But in metal-on-metal hips, either because of poor design or poor implant technique, the ball can sometimes press against the cup's edge.

但是，对于金属对金属介面人工髋关节来说，由于设计拙劣或者植入技术不良，球体有时可能会压迫到杯状杯臼的边缘。

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They will either have a straight or slightly curved edge.

他们的刀锋要么是直的要么是有点弯曲。

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If, however, the pair appears on the edge of an event horizon, either particle or hole may wander across the horizon, never to return.

然而，如果两者出现在视界的边缘，粒子或者黑洞都可能穿过视界再也不会来。

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The center doesn't seem to have either the edge or the passion to grab the same kind of traffic.

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IPhone users currently can use either the Edge network or wi-fi for data service.

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As a result, way too many of our citizens have either lost their home or are living on the edge.

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