Secocholestane
斷膽甾烷
??? 情景例句
He is not cut out for teaching.
他不是當(dāng)教師的料。
A light heart lives long.
心胸開朗，使人壽長。
I'm sorry, I don't know. You'd better ask that policeman.
對不起，我不知道。你最好問問那位警察。