Lefter
莱夫特
🗣️ 情景例句
He always performs his tasks perfectly.
他总是圆满地完成工作。
What are you reading?
你正在读什么？
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。