warn

警告、示警

The signs warn drivers about falling rocks on this road.

告示牌警告驾驶人这条路上有落石。

告诫、劝告

My doctor warned me to cut down on salt.

医生告诫我要减少盐分摄取。

预先通知、事先告知

They warned us that the meeting might run late.

他们事先告知我们会议可能会延后结束。

发出警告

Economists have warned of another downturn next year.

经济学家已对明年可能再度衰退提出警告。

警告离开、劝阻

Security guards warned us off the construction site.

警卫警告我们离开工地。