HSK 7-9
来之不易
láizhī-búyì(idiom) hard to come by; not easily obtained
大家格外珍惜来之不易的机会。
Dàjiā géwài zhēnxī láizhī-búyì de jīhuì.
Everyone especially treasures this hard-won opportunity.
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Appears across levels (7-9) in the HSK 3.0 word list.