Synovialis
[醫] 滑膜
??? 情景例句
Oh. I'm sorry.
噢，對不起。
The stronger the motivation, the more quickly a person will learn a foreigh language.
一個人學外語的動力越強大、學得就越快。
Somebody's knocking at the door. I'll answer it.
有人在敲門，我去開。