外来异物英语怎么说

外来异物的英文是 "foreign object"。
来源：这个词组通常用于医学领域，指的是在身体内不应该存在的物体，如医生在手术中漏掉的器械或病人吞下的物体。
例句：
The patient had to undergo surgery to remove the foreign object that was causing him pain.
(病人不得不接受手术来删除导致他疼痛的外来异物。)
The X-ray showed a foreign object in the patient's lung.
(X光显示病人肺部有一个外来异物。)
The foreign object was a small piece of metal that had been accidentally inhaled.
(外来异物是一个被意外吸入的小块金属。)