Fluorescer
荧光剂; 荧光增白剂
🗣️ 情景例句
It's seventy-five cents for adults and thirty cents for children under twelve.
大人75美分，12岁以下的小孩30分。
There are four quarters in every dollar.
每美元有四个二角五分。
No, they aren't.
不，不是。