引起主场效应的基本因素为主场的条件效应、主场的竞赛效应和运动员的主客场心理感受差异效应。
The effects of home field environment, competition at home field, and players' inner experience difference of home and away matches are the three basic factors of home advantage.
不过其中的原因并不清楚，这就好比经济学家们并不知道“主场效应”具体能发挥多大的作用一样。 因此，对他们来说，预测出英国今年能够包揽奖牌的数量就相当于赢得了这项百米冲刺的冠军一样。
Why it does so is unclear, as is the exact size of the "host effect"—which is why, for economists, predicting how many medals Britain will bag is the equivalent of winning the 100-metre dash.
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