名词
中文翻译：异物
同义词：
['foreign substance', 'foreign object']
例句：
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1. The foreign body was causing theinfection.
这个异物导致了感染。
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2. Theforeign body had to beremoved surgically.
这个异物必须通过外科手术移除。
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3. Theforeign body could not bedetected by the medical scanner.
这个异物无法被医疗扫描器检测到。