Principle valenvy
[电] 主价
🧩 词语组成解析
🗣️ 情景例句
around your schedule,
配合你的时间表
Excuse me I couldn't help you.
对不起我不能帮助你。
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。