latchkey ['lætʃki:]

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附加级

n.钥匙

On the doorstep he felt in his hip pocket for the latchkey. 他站在门口的台阶上，摸了摸后裤兜，找大门钥匙。
Someone was opening the front door with a latchkey. 有人在用门锁钥匙开前门。