Worker bees secrete royal jelly to feed the queen bee.
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Literally 'bee-king-paste': 蜂 (fēng, bee) + 皇 (huáng, emperor) + 浆 (jiāng, thick liquid/paste). The substance that turns a larva into a queen. Also written 蜂王浆 (fēngwángjiāng) with the same meaning.