你需要证据。
如果你需要证据，只要看看2011上个月财务收益报告就会明白。
Just see last month's Q4 fiscal 2011 earnings report if you demand proof.
如果你需要证据，那就打开体育频道，你一定会看到有那么一两个运动员在对自己说着鼓劲儿话，或是在没投中球后狠狠地责备自己。
If you want proof, turn on the sports channel. You're bound to see an athlete or two gearing themselves up with a tart phrase or scolding themselves after a bad shot.
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