Hras
[医][=high-rate activated sludge waste treatment]高速活性污泥废水处理
🗣️ 情景例句
You will never guess.
你绝对猜不到。
The old lady takes delight in visits from her grandchildren.
那个老妇人以孙辈门看她来为乐。
Yes, it is.
是的。