Semialdehyde
半醛
??? 情景例句
I have two days off a week.
我一星期休息兩天。
Yes, we have been interested in new system.
是的，我們對新系統很感興趣。
he realizes its volume, as the space that the shape displaces in the air.
他能意識到物體的體積，那就是它的形狀在空氣中所占的空間。