HSK 7-9
反之
fǎnzhī连
on the other hand...; conversely...
方法正确会成功反之会失败。
Fāng fǎ zhèng què huì chéng gōng fǎn zhī huì shī bài.
The correct method leads to success; conversely, the wrong one leads to failure.
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Appears across levels (7-9) in the HSK 3.0 word list.