可能会被锤子敲到手指，或者被钳子夹到，如此简单。这两种情况都会使人受伤。
It may have been something as simple as hitting your finger with a hammer or pinching yourself with a pliers. In either case it hurt.
虽然啃咬指甲通常不会使人受伤，但如果你咬伤了指甲周围的皮肤，仍然会导致出血并可能造成细菌感染。
While nail biting is not generally harmful, if you attack the cuticles you can risk bleeding and bacterial infection.
拥挤很危险，会使人受伤。
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