Concentration limit
[化] 浓度极限
🧩 词语组成解析
🗣️ 情景例句
used for new books
被用来购买新书
I know the boy whose father is a banker.
我知道那个男孩的父亲是银行家。
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。