If you are careful, you give serious attention to what you are doing, in order to avoid harm, damage, or mistakes. If you are careful to do something, you make sure that you do it.
Be very careful with this stuff, it can be dangerous if it isn't handled properly.
搞不好可能就会发生危险。
Careful on those stairs!
走那些楼梯时要小心!
Careful work, thought, or examination is thorough and shows a concern for details.
He has decided to prosecute her after careful consideration of all the relevant facts.
在仔细考虑了所有相关事实后,他决定起诉她。
If you tell someone to be careful about doing something, you think that what they intend to do is probably wrong, and that they should think seriously before they do it.
I think you should be careful about talking of the rebels as heroes.
我认为你还是当心点好,别把叛乱分子说成是英雄。
If you are careful with something such as money or resources, you use or spend only what is necessary.
Industries should be more careful with natural resources.
各行业应更加节约自然资源。