6 t9 O* Q4 O% A9 E, O6 l9 X @Theory is when you know everything but nothing works.( ]7 `. G! g7 E3 O
$ ?9 h @5 f( n: VPractice is everything works but no one knows why. : c' E1 M. A, a, h) Z, c- E& `: e6 S- e/ Q- {$ g0 i
这两天的情况是:Theory and practice are combined: nothing works and no one knows why.