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密闭门
密閉門
mìbìmén
1. airtight door

Character Breakdown

密
mì
secret, confidential; intimate, close; dense, thick
HSK 4 11 丶
闭
bì
to shut, to close; to obstruct, to block
HSK 5 6 丶
门
mén
gate, door, entrance, opening
HSK 2 3 丶

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