Fluorescer
荧光剂; 荧光增白剂
🗣️ 情景例句
Oh, thank you.
啊 ，谢谢。
As the old cock crows, so doth the young.
有其父必有其子。
What invariably happens is that a great number of things choose to go wrong at precisely the same moment.
情况经常是这样的，许许多多的事情都偏偏赶在同一时刻出问题，