Not to say you have to walk around with a grin all the time!中walk around
A genuine smile from within shows on the outside:you smile with your eyes and mouth.Not to say you have to walk around with a grin all the time!
真正的微笑是从内到外散发出来的：你的眼睛和嘴都在笑.这不是说你要一直咧着嘴笑!
walk around 绕.而走,