be serious about＝ 用心、认真对待；例子：The main point is to be very serious about guitar playing.重点是要非常认真的演奏吉他。 be strict with＝严格要求，例子：At the beginning of this term the teacher in charge of our class was very strict with us.这学期开始,我们的班主任老师对我们要求非常严格。 be strict in＝严于； 有用请采纳...
serious严肃，一本正经 严重（的事故）strict严格be serious with sb.对人严肃be serious about sth.对某事是认真的。 be strict in sth对事情的要求严格如：We should be strict in (doing) our work.对工作我们...
