HSK 6 · preposition
于
at; in; on; from; to (formal preposition)
这本书出版于二〇一〇年。
Zhè běn shū chūbǎn yú èr〇 yì〇 nián。
This book was published in 2010.
关于考试，我有几个问题。
Guānyú kǎoshì, wǒ yǒu jǐ ge wèntí.
About the exam, I have a few questions.
他终于找到工作了。
Tā zhōngyú zhǎodào gōngzuò le.
He finally found a job.
这个方法便于使用。
Zhège fāngfǎ biànyú shǐyòng.
This method is easy to use.