noun · an object or substance that has entered the body from the outside, often in a medical context

医护人员小心地从他的伤口中取出了异物。

noun · a strange, abnormal creature or an extraterrestrial life-form

宇航员在荒凉的行星表面发现了一个正在蠕动的异物。

noun · a rare, precious, or unusual object or an exotic delicacy

这些深山中的异物在城市里很难见到。