Dimethyldichlorosilance
二甲基二氯硅烷
🗣️ 情景例句
have become good friends, haven't you?
成了好朋友，不是吗？
How much is the telephone bill a month?
每个月电话费要多少钱？
Yes, but what are in the boxes?
哦，那箱子里是什么呢？