山高水險

shan1 gao1 shui3 xian3

lit. the mountains are high and the torrents swift, to undertake an arduous task or journey (idiom)

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山高水險|山高水险 [shān gāo shuǐ xiǎn] ► lit. the mountains are high and the torrents swift ► to undertake an arduous task or journey (idiom)