3 v: k r' r& s' |! pTheory is when you know everything but nothing works.7 ^& ]; ]! b0 K x4 l% l
2 t+ }* }; d7 S" j5 k9 \Practice is everything works but no one knows why. $ S' N* I/ B) \. I% x. @4 h5 {) ] ' k# ?' Q. F; @! N这两天的情况是:Theory and practice are combined: nothing works and no one knows why.