Pickeringite
鎂明礬
??? 情景例句
Yes, Richard.
說吧， Richard。
After dinner comes the reckoning.
吃喝玩樂，該付代價。
What about the Natural History Museum? So far as I know, it's free.
去自然歷史博物館怎么樣？據(jù)我所知，那兒是免費的。