已经提醒开车的人当心冰封的路面。

Motorists have been warned to beware of icy roads.

那是个游泳的好去处，但要当心危险的水流。

It's a great place for swimming, but beware dangerous currents.

当心别喝得太多！

Take care you don't drink too much!

“当心！”我大喊一声。

‘ Look out! ’ I hollered.

当心——盘子烫手。

Be careful ─ the plates are hot.

尝尝我的李子酱——但得当心有核儿。

Have some of my plum jam ─ but mind out for the stones.

当心那个杯子，你这笨手笨脚的家伙！

Mind that cup, you clumsy oaf!

他大叫道：“当心！”

‘ Be careful! ’ he yelled.

当心别上当让他把残次品卖给你。

Make sure he doesn't try to palm you off with faulty goods.

天花板很低，当心别碰着头。

Watch your head on the low ceiling.

请当心别打碎我的眼镜。

Please be careful with my glasses.

当心站起来时头别撞了横梁。

Be careful not to bump your head on the beam when you stand up.

当心脚下！

Mind where you're treading!