Osmocene
二茂锇
🗣️ 情景例句
Me?
我吗？
May I speak to Mr. Johnson, please?
我想请约翰先生听电话好吗？
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。