HSK 6
牢
láo名形
(literary) pen; fold (for livestock); prison; jail; firm; secure; fast
请把车门关牢以后再走。
Qǐng bǎ chē mén guān láo yǐ hòu zài zǒu.
Please close the car door securely before leaving.
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New in the HSK 3.0 word list at level 6.