7.Never frown,even when you are sad, because you never know who is falling in love with your smile.纵然伤心，也不要愁眉不展，因为你不知道谁会爱上你的笑容。
frown v. 皱眉头，不同意
The teacher frowned angrily at the noisy class.老师对那班吵吵嚷嚷的学生皱起了眉头。
