Scientists set up an avian casino in which pigeons could place their bets on one of two symbols.
科学家们设置了一个鸟类的“卡西诺赌场”,在那里放上两个标志以供鸽子下赌注。
Mr Obama's fate depends more on two big bets he placed well before the Republican capture of the House in November's mid-terms.
奥巴马的命运更多取决于他在十一月中期选举前押下的两大赌注,当时共和党尚未取得众议院控制权。
Even in such an unpredictable contest, two outcomes are sadly fairly safe bets.
令人难过的是,即使是在一场如此难以预测的竞赛中,两个结果仍十分可能。
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