Episulfide
环硫化物
🗣️ 情景例句
When was your last complete physical?
上一次全身检查是什么时候？
How much is the interest a year?
每年利息多少？
They are working hard on the farm. The children are picking apples.
他们正在农场卖力地干活。孩子们在摘苹果。