Perphosphate
过磷酸盐
🗣️ 情景例句
It was a gradual process, involving many factors.
这是个渐进的过程，涉及到方方面面。
He has a letter.
他有一封信。
Holiday hotels tend to cater for one nationality of visitors especially, sometimes exclusively.
假日旅馆有只接待来自一个国家的旅游者的倾向，有时会达到排他的程度。