The airmen don't fly until they're needed. That means waiting, sometimes for hours or even days.
VOA: standard.2010.04.27
Any thoughts? Don't you hate professors who stand here waiting for you to answer, even when they have candy?
你们难道不讨厌站在那儿等你回答问题,的教授么?虽然他有糖果做奖品哦,用少于线性时间完成可能么?
And again, you don't teach an animal to play Ping-Pong by waiting for it to play Ping-Pong and then rewarding it.
同样,你并不能通过等待动物打乒乓球,然后给其奖励,来使动物学会打乒乓球。
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