Opticalmechnical
光学机械
🗣️ 情景例句
before getting to the tough stuff--math.
在对付难缠的东西 数学 之前。
What? I'm right, aren't I?
怎样？我没说错吧！
A great many former pupils will be attending a farewell dinner in his honour next Thursday.
很多老同学都准备参加下星期四为他举行的告别宴会。