Biocalcirudite
生物礫屑灰巖
??? 情景例句
He has the advantage of a good education.
他有受過良好教育的優勢。
How much is a one-way ticket to Beijing?
一張到北京的單程票要多少錢？
Yes. It's time for class. Let's go.
是的。上課的時間到了。我們走吧。