Fortunately, there exist some key principles you can follow.

幸运的是，有一些现成的关键原则你可以遵循。

youdao

However, there exist some disadvantages.

然而，也存在一些缺点。

youdao

However, there exist some problems worth our thinking.

但尚存在一些需要思考的问题。

youdao

He says there is now some calm that did not exist before.

VOA: special.2009.05.29

There will need to be some organizing structures or frameworks or standard bodies that exist to coordinate that.

需要组织结构,框架或者标准,来协调这些网站。

麻省理工公开课 - 媒体、教育、市场课程节选

Now, maybe there's some other reason to believe the claim that nobody believes they will cease to exist.

现在，也许还有另一些原因让人相信,没有人会相信自己会死亡。

耶鲁公开课 - 死亡课程节选

If the company ceases to exist, there has to be some kind of wrap-up.

FORBES: Raising Money From the (Corporate) Dead

Somehow, someway, there are some people out there who still claim it doesn't exist.

WHITEHOUSE: Press Briefing

There are no set rules, but some conventions exist.

FORBES: J.C. Penney: To Avoid Wild Stock Swings, Quarterly Reports Shift To Afternoon