未经批准不得进入警戒地区。

You may not enter the security area without authorization.

《牛津词典》

她未经许可擅自使用了汽车。

She took the car without permission.

《牛津词典》

他在未经君王许可而发言。

He was speaking without the prince's authority.

《柯林斯英汉双解大词典》

His adventurous song is one that "with no middle flight intends to soar above th' Aonian Mount, while it pursues things unattempted yet in Prose or Rhyme."

他那具有冒险精神的诗歌,“抛开了中途的旅程，要一飞冲天越过爱奥尼神山，同时追寻使用在未经使用的韵律“

耶鲁公开课 - 弥尔顿课程节选

Often, to illustrate the issues of ambiguity, people have collected poorly thought-out headlines in newspaper reports that play on--that inadvertently have ambiguity.

通常,为了说明模糊性的问题,人们收集了那些未经深思熟虑的,在无意间造成模糊性的新闻标题

耶鲁公开课 - 心理学导论课程节选

So, these laws are, they're really depillars.

这些定律是未经证明的。

麻省理工公开课 - 热力学与动力学课程节选