HSK 7-9
碰巧
pèngqiǎo副
by chance; by coincidence; to happen to
我去取书时碰巧赶上闭馆。
Wǒ qù qǔshū shí pèngqiǎo gǎnshàng bìguǎn.
I happened to arrive just as the library closed when I went to pick up a book.
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Appears across levels (7-9) in the HSK 3.0 word list.