Displacer
n. 取代劑, 過濾器, 置換劑\\n[化] 排代劑; 置換劑; 頂替劑
?? 醫學釋義
置換器，排出器
??? 情景例句
Tell me the courses you have completed in school and what is your favorite subject?
你曾修讀哪些課程和你最喜歡哪一科？
He who makes no mistakes makes nothing.
不犯錯誤者一事無成。
Well, we listened to lectures about pollution, agriculture, nuclear waste, radiation and so on.
噢，我們聽取有關污染、農業、核廢料、輻射等講座。