Tricalcium
三钙
🗣️ 情景例句
We've called it quits.
我们决定放弃（我们之间的关系了）。
I wish you had called me back the next day,as I had asked you to.
我希望你明天打电话给了我回来,正如我要你做的。
Once the oxygen content of the air had risen to 25% it was ready to burn.
一旦氧气在空气中的含量达到25%，它就要燃烧。