2PHRASE 挑战限制尺度;突破原有底线 If someone pushes the envelope, they do something to a greater degree or in a more extreme way than it has ever been done before. 挑战限制尺度;突破原有底线
There's a valuable place for fashion and design that pushes the envelope a bit.
在原有尺度上有所突破的时尚和设计受到人们的重视。
No cinema director had a more profound effect in pushing the envelope of acceptable family entertainment.