Episulfide
环硫化物
🗣️ 情景例句
Thanks. Excuse me.
谢谢。对不起，失陪了。
How much does the elephant weight?
这个大象有多重？
All the other boys are Chinese. All of the Chinese students are Young Pioneers.
其余的男孩都是中国人。所有的中国学生都是少先队员。