foreign substance
foreign substance 异物 指在人的身体或器官的任何部分存在的物质，而该物质在正常情况下不会产生，一般系由外界进入。病人在发现或应当发现体内有异物时，才可以开始对在其体内遗留该异物的医师提起诉讼，这一规则所指的「异物」包括因服用而进入体内的药物。
FOREIGN SUBSTANCE
foreign substance
foreign substance. A substance found in a body, organism, or thing where it is not supposed to be found (the plaintiff sued because she thought she saw — and later confirmed that she had found — a foreign substance (namely, a piece of glass) in her hamburger).