viper的发音

be careful

读音：英 [bi: 'keəfl] 　 　 美 [bi: 'keəfl] 　 　

解释：当心, 注意

列句：

careful about what you say.

对你所说的话要小心。

should be careful when making a promise.

你应当谨慎做出承诺。

careful!

一定要小心！

careful crossing the road.

过马路要当心。

careful of that viper; he is dangerous.

小心那个阴险的人，他很危险。

careful of that chair; it's a bit rocky.

当心，那椅子有些不稳。

careful when you cross the road.

过马路时要当心。

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。