Armcoiron
阿姆柯磁性铁
🗣️ 情景例句
What subject did you major in university?
你在大学主修的科目是什么？
They used to live there, didn't they?
他们过去住在哪里，不是吗？
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。