HSK 6
通道
tōngdào名
(communications) channel; thoroughfare; passage
安全通道不能堆放任何物品。
Ān quán tōng dào bù néng duī fàng rèn hé wù pǐn.
Nothing may be stored in the emergency passage.
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New in the HSK 3.0 word list at level 6.