Nitrocalcite
钙硝石
🗣️ 情景例句
And you won't be able to speak for a while.
有一段时间 你们没有办法讲话。
The war threatened his well-being.
战争威胁他的幸福。
For the first time in his life, he became the proud owner of a bed which had springs and a mattress.
他平生第一次自豪地拥有了一张既有弹簧又带床垫的床。