Shǔyào yídìng yào fàng zài háizi gòu bùdào de dìfāng.
Rat poison must be kept where children can't reach it.
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Pure compound: 鼠 'rat/mouse' + 药 'medicine/drug' = 'rat-medicine' = poison. The same 药 appears in 农药 (pesticide) and 杀虫药 (insecticide). When 药 follows the target, it usually means a substance to kill it.