Calcinitre
钙硝石
🗣️ 情景例句
Some people are afraid of flying, which limits their options when traveling.
一些人十分害怕坐飞机，这也就限制了他们旅行时的选择了。
We have known each other for 6 years.
我们认识有六年了。
I seldom have any difficulties.
我很少碰到困难。