Be very careful with this stuff, it can be dangerous if it isn"t handled properly 這東西一定要小心，稍不注意的話就會有危險。He has decided to prosecute her after careful consideration of all the relevant facts在認真考慮了所有相關事實後，他決定起訴她。I think you should be careful about talking of the rebels as heroes 我覺得你說話應該小心，不能把反叛分子當英雄。You will have to make a special effort to train your child to be careful with herpocket-money 你得格外注意培養孩子的節儉意識，零花錢要省著花。