C1 If advice, criticism, or actions are constructive, they are useful and intended to help or improve something.建设性的;有益的;有用的;积极的
She criticized my writing, but in a way that was very constructive.她批评了我的作品,但是以一种非常建设性的方式——我受益匪浅。
If you don't have anything constructive to say, it's better to say nothing.要是你没什么有用的话要说,最好保持安静。