Be careful lest you ( should ) fall from the tree.

Be careful not to be beaten up by the enemy.

当心别遭敌人暗算.

Be careful not to scald yourself with the steam.

小心别让蒸汽把你烫着。

Be careful not to slip.

小心，别滑倒了。

Be careful she's not just using you.

当心她不只是在利用你。

"Be careful!" — "Sure thing, Dad. So long."

“要多加小心!”——“一定会的，爸爸。再见。”

You have to be careful what you say on telly.

在电视上说话时你必须很谨慎。

Drivers need to be careful of children playing on the streets.

司机要格外注意街上玩耍的孩子们.

Be careful of the low tide, when the islands are connected!

当这些小岛连着的时候, 低潮的时候要小心.

Be careful of the slippery rocks.

小心,岩石很滑.

Be careful of Tokyo girls, too, they're expensive.

对东京女子要格外小心, 她们太会花钱.

Drivers should be careful of pedestrians in town.

在城里,驾驶车辆的人应该注意行人.

Be careful of the icy pavement; it's really glassy , ie slippery.

小心人行道上有冰, 路面可真滑.

They had to be careful of floating chunks of ice.

他们必须当心大块浮冰。

" Be careful of my friend , I entreat you, and leave me. "

“ 求你小心照顾我的朋友, 去吧. ”

Be careful of your health.

留心你的健康.

Be careful of yourself!

保重保重.

Be careful of what you are doing.

注意你的所作所为.

We must be careful of public property.

我们必须爱护公共财物.

Be careful of the material; it's too precious to waste.

仔细这些材料, 它太不易搞到,不可浪费.

Children must be taught to be careful of traffic.

必须教育孩子要当心车辆.