Fluorination
n. 氟化作用
🗣️ 情景例句
Summer is vacation time.
夏季是度假的好时机。
I'm sick and tired of having to take care of your brother just because he refuses to go out and find a job.
只是因为你弟弟不肯出去找工作就得我来照顾他，这真让我烦透了。
She also likes them to borrow the books. But she is very strict.
她也喜欢他们来借书。但她对大家非常严格。