Castordag
(胶体石墨和蓖麻油组成的)液体润滑剂
🗣️ 情景例句
If you're under twenty-one years of age ...
如果你还不到二十一岁……
A friend is a second self.
朋友是另一个我。
At the end of the concert, there was a great applause.
音乐会结束时，响起了热烈的掌声。