HSK 7-9
千变万化
qiānbiàn-wànhuàcountless changes; constant permutation
市场需求总是千变万化。
Shìchǎng xūqiú zǒngshì qiānbiànwànhuà.
Market demand is constantly changing.
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Appears across levels (7-9) in the HSK 3.0 word list.