& {5 U+ i# k; @* GTheory is when you know everything but nothing works. * ?0 b' W8 v7 a3 m$ N. X5 h; j/ A' g& g1 G8 U4 i; r
Practice is everything works but no one knows why.: s7 L7 I8 I1 \
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这两天的情况是:Theory and practice are combined: nothing works and no one knows why.