Please balance your ability before you help them and bewared . Some of them may hurt you by your have a kind heart .
帮助他们要量力而行，也要小心，否则他们也会利用你善良的心来伤害你。
The great harm of particulates emissions from diesel engine has been more and more bewared by people , and becomes one of the key problems of diesel engine 's development in the future that need be solved urgently .
