6 K ] G3 j! g' [! c3 Q5 RTheory is when you know everything but nothing works.) y$ c. ?6 ^. X. O. O! x* E
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Practice is everything works but no one knows why./ T. K8 k# J, z/ Y3 f
' _9 D) }1 X% y' i; o9 C这两天的情况是:Theory and practice are combined: nothing works and no one knows why.