Laurvikite
歪堿正長巖
??? 情景例句
If I fail this exam I'll fail the course.
我要是考試沒通過，這門課就沒學(xué)分了。
I'm not really sure about that. Mr. Jiang should know the answer to that.
關(guān)于那事我不敢確定，蔣先生應(yīng)該知道答案。
The letter x stands for an unknown number.
字母x代表未知數(shù)。