alien material

• 异物

alien material的用法和样例：

例句

1. Such foreign material can produce a granulomatous reaction.
   这样的异物可促使肉芽肿形成。
2. Also, foreign material detecting stopping and alarming function is delivered by using photoelectric and infrared detecting technologies.
   应用光电探测红外线探测技术，实现了异物探测自动停车与报警功能。