With goals, maybe you will not achieve them, but without them, you must be lost.

有目标不一定赢，但没有目标一定会输。

youdao

If you are not prepared to take life, you must often be prepared for lives to be lost in some other way.

如果你不打算剥夺生命，你就必须经常预备以其它方式失去生命。

youdao

You must have the supervisor’s permission to leave the room during the test. Any time lost cannot be made up.

在考试中间你必须在得到监考人员允许的情况下才能离开考场，损失时间自负。

youdao

But you must be careful. It is easy to get lost in the waves of moving sand especially during sandstorms.

VOA: special.2010.01.04

If you're not taking notes in this lecture, you have to write down at least one sentence. You must write this down because this will be the most important thing I say all morning: Milton's Paradise Lost is the first narrative poem in English that didn't rhyme.

就算你们这堂课不记笔记，也一定要记下至少一句话，一定要把这记下来,这是我一早上说的最重要的一句话了：,弥尔顿的《失乐园》是,第一首不押韵的英语叙事诗。

耶鲁公开课 - 弥尔顿课程节选