B2 to open something, especially a door that is locked (= fastened with a lock) using a key or an electronic device打开;(尤指用钥匙或电子设备)开(门)
to discover important new facts about something解开…之谜;发现…的秘密
to make the imagination more active, producing interesting ideas and images放飞想象力
More examples
Having my car stolen really taught me a lesson - I'll never leave it unlocked again.
Leaving your house unlocked is an open invitation to burglars.
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