They warn us of dangerous trends. They point out potent evils.

他们为我们警告对危险倾向，指出潜在的邪恶。

youdao

They warn that the lack of sleep is having a serious knock-on effect on our health.

他们警告说，睡眠不足会给我们的健康带来严重的连锁反应。

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They warn that children already spend too much time in front of TVs, DVD players and computers.

他们警告说孩子们已经在电视、DVD、和电脑前花了太多时间。

youdao

But,they warn that persons with weakened defenses for fighting disease are at greater risk.

VOA: special.2009.10.13

They warn us of dangerous trends. They point out potent evils.

他们为我们警告对危险倾向，指出潜在的邪恶。

耶鲁公开课 - 1945年后的美国小说课程节选

Firefighters say they are making progress, but they warn that it might not be contained for another two week.

VOA: standard.2009.09.01

But they warn against phoney sincerity, and (perhaps surprisingly) they advocate displays of weakness.

ECONOMIST: The genuine article

They warn that they won't make such loans because they carry increased legal risk.

WSJ: Prebuilt Loan Predicament

And as for the Polisario, they warn that this refurbishment deal comes at a dangerous time.

BBC: News Online