- X/ Z0 H0 q! B" R5 wTheory is when you know everything but nothing works. ; { c' R. X/ ~1 X, a% y4 d: M! [. h+ @& G8 U; e0 x
Practice is everything works but no one knows why. ) Y2 Q# H2 D. R" F! Z* v * i7 A% k% n- G C) G这两天的情况是:Theory and practice are combined: nothing works and no one knows why.