. R. l# q$ h3 t* VTheory is when you know everything but nothing works., d- o6 |# \5 M& P9 p
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Practice is everything works but no one knows why. : X( f, T& u; n' @* E2 R' a; m5 C; Y, n7 U
这两天的情况是:Theory and practice are combined: nothing works and no one knows why.