/ ?% g1 h( s5 y8 G6 d. o0 K$ mTheory is when you know everything but nothing works. . F- Z2 `# R) f! Q2 O1 } 8 p2 Q& D* E6 [% ?Practice is everything works but no one knows why.6 b( y9 \1 Z5 e5 U3 e! R3 [! E
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这两天的情况是:Theory and practice are combined: nothing works and no one knows why.