Polysulfuration
聚硫化作用
🗣️ 情景例句
That's a relief.
现在我放心了。
We can offer you a price of 8 pounds per item, from 20 days, after which the price will be subject to an increase of 5%.
我们给您报价每件8英镑，有效期20天，过期价格增加5%。
Mrs.Ramsay received an anonymous letter.
拉姆齐太太收到一封匿名信。