Shāngchǎng rú zhànchǎng, xiǎoxīn tánglángbǔchán de júmiàn.
The marketplace is a battlefield — beware of mantis-stalking-cicada situations.
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From 《庄子·山木》and 刘向《说苑·正谏》: a mantis crept up on a cicada, unaware that a yellow finch was stalking the mantis. Full form: 螳螂捕蝉,黄雀在后. Often invoked when warning someone chasing short-term wins to watch their back.