Miànduì bùgōng, tā xuǎnzé míngzhébǎoshēn, méiyǒu zhàn chūlái.
Faced with injustice, he played it safe and didn't speak up.
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From 《诗经·大雅·烝民》 - 明且哲,以保其身 described the wise minister who stayed clear-headed to serve his lord. Modern Chinese has narrowed the sense toward cowardly self-preservation.