Hdl
[化] 高密度脂蛋白
??? 情景例句
I'm really sorry to hear about that.
聽到這個消息真讓我感到難過。
I'm always confused with s and th.
我常把s和th搞混。
A Frenchman, for instance, might find it hard to laugh at a Russian joke.
譬如，法國人聽完一則俄國笑話可能很難發(fā)笑。