) N! p* l/ v, B; G. q0 |' m* K+ OTheory is when you know everything but nothing works. : _8 f* }9 c5 ~1 ^5 L' h: Q4 v: P7 |9 _9 ^7 V
Practice is everything works but no one knows why. * ? d1 g' Q7 ^) ?( f) X" B, J - Y+ E+ C$ s! m: J- Z这两天的情况是:Theory and practice are combined: nothing works and no one knows why.