Eburnitis
牙釉质密固
🗣️ 情景例句
How are you getting on with your studies?
你功课情况如何？
I will be going home in a few monyhs from now.
我将在几个月后回家去。
Suddenly they came to a waterfall which dropped into an underground lake at the bottom of the cave.
突然，他们来到一道瀑布前，那瀑布奔泻而下，注入洞底一处地下湖里。