Infrasil
一種紅外硅材料
??? 情景例句
What subject did you major in university?
你在大學主修的科目是什么？
The class made noticeable improvement.
這班有明顯的進步。
No, I'm not.I'm going to retire.I feel very tired.
不，我不準備拍了。我準備退休了。我感覺累得很。