Stob
长铁楔
🗣️ 情景例句
We are from Shanghai.
上海。
He always comes rushing up at the last moment.
他往往到最后的一瞬间才急忙赶来。
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。