Polysulfuration
聚硫化作用
🗣️ 情景例句
There has been very little progress this term.
这学期没有什么进步。
I know the boy whose father is a banker.
我知道那个男孩的父亲是银行家。
Clusters of tin insects called aphids were to be found on the underside of the leaves.
结果在树叶背面找到成串的叫作蚜虫小虫子。