5 ?, B/ o& h* |! a' k4 jTheory is when you know everything but nothing works. B( J1 g+ `: o) I9 }
% u2 H; T# H) M4 h4 J w bPractice is everything works but no one knows why.! R" P r9 ]8 W* V" I: K
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这两天的情况是:Theory and practice are combined: nothing works and no one knows why.