Polysulfuration
聚硫化作用
🗣️ 情景例句
OK, OK- just try to calm down, sir.
好，好，请冷静下来，先生。
The first step is as good as half over.
第一步的成功等于事情的一半已完成。
Is there much of a price difference.
价钱有很大的差别吗？