不然 (bù rán) means “not so; no; or else; otherwise; if not; How about ...?”. It is an HSK 5 Chinese word in the HSK 3.0 vocabulary.
我们必须努力学习,不然会考不上大学。
Wǒmen bìxū nǔlì xuéxí, bùrán huì kǎo búshàng dàxué.
We must study hard, otherwise we won't get into university.
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