Fluoram
二氟化铵
🗣️ 情景例句
I'm not sure I get your point.
我恐怕没听懂你的意思。
I dress my sister and wash her hands and face.
我给我妹妹穿衣服，洗脸洗手。
When they were very young, Mr. Green sometimes dressed up in a red coat. But he doesn't do that now.
在他们很小时，有时候格林先生穿上一件红色的外套。但他现在不那么做了。