3 o" e- e1 e. B8 h2 lTheory is when you know everything but nothing works. ' E- s1 Z% S/ H& @2 U2 \ ) q# u0 u7 v4 T' T$ n- SPractice is everything works but no one knows why. / f9 O5 b3 q* z, Q0 ^1 t+ l V9 V: i$ z4 ~5 m" @" f* J( k* z" ~
这两天的情况是:Theory and practice are combined: nothing works and no one knows why.