Episulfide
环硫化物
🗣️ 情景例句
How ofter have met with our competitors?
你多久遭遇我们的竞争对手一次？
Rome was not built in a day.
罗马并非一日可建成；坚持必成。
During all these tests Vera was blindfold;
在所有这些实验中，维拉的双眼都是蒙着的。