Polyphosphate
多磷酸盐
🗣️ 情景例句
How many brothers and sistes do you have?
你有多少个兄弟姐妹？
In college I majored in history, What was you major?
大学时我主修历史，你主修什么呢？
He has made neat paths and has built a wooden bridge over a pool.
他修筑了一条条整洁的小路，并在一个池塘上架了一座小木桥。