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。
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。
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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