Nitrocalcite
钙硝石
🗣️ 情景例句
We need to bring a flashlight.
我们需要带一个手电筒。
I ate too much candy. I have a toothache.
我吃了太多的糖果。牙齿在痛哩。
but each year, the dogs are still sent out into the snow whenever a traveller is in difficulty.
但每年还要派狗到雪山地里去帮助那些遇到困难的旅游者，