" Q0 e& d N6 E4 F- A3 TTheory is when you know everything but nothing works. ) Z# T9 S) e$ m6 `8 ]. f1 u; H 3 a1 [: G, [5 k% d4 } H& MPractice is everything works but no one knows why. + [4 _2 s7 y {! ~7 D2 N3 m6 Y0 L/ h3 {( \$ r$ U6 y. q
这两天的情况是:Theory and practice are combined: nothing works and no one knows why.