未經許可，不得擅自進入。
Do not enter without permission.
Listen to pronunciation
Example sentences
我未能完成任務。
我未能完成任务。
I have not yet completed the task.
未經許可，不得隨便動用這筆公款。
One must not use this public fund randomly without permission.
由於天氣惡劣，飛機遲遲未能起飛。
Due to bad weather, the plane could not take off for a long time.
任何未經授權的飛機侵入領空都將被攔截。
Any unauthorized aircraft intruding into the airspace will be intercepted.
Usage Notes
A formal adverb used to indicate that something has not happened or is not the case. Often found in compounds like '尚未' (not yet) or '未必' (not necessarily).
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