be careful
读音：英 [bi: 'keəfl] 美 [bi: 'keəfl]
解释：当心, 注意
列句：
1.Be careful about what you say.
对你所说的话要小心。
2.You should be careful when making a promise.
你应当谨慎做出承诺。
3.Be careful!
一定要小心！
4.Be careful crossing the road.
过马路要当心。
5.Be careful of that viper; he is dangerous.
小心那个阴险的人，他很危险。
6.Be careful of that chair; it's a bit rocky.
当心，那椅子有些不稳。
7.Be careful when you cross the road.
过马路时要当心。
8.Be careful not to lose too much liquid by evaporation.
小心，不要因为蒸发作用而失掉过多的水份。