; `1 |5 K6 x( v1 }2 fTheory is when you know everything but nothing works.' y8 |( Q$ v( o9 u* C! H, o6 E) N
! E9 R/ m, p# X7 Z9 Z% F) s
Practice is everything works but no one knows why.4 M; n8 R9 \+ t1 D$ K* q
- _0 r! z% U3 {) ^. L2 t
这两天的情况是:Theory and practice are combined: nothing works and no one knows why.