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.

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。

youdao

For example, if you eat 10 Mcdonald's big-macs per day (cause) you are almost certain to end up obese with a host of illnesses (effect).

比如，如果你每天吃10个麦当劳的巨无霸(原因)，你差不多必然会变得肥胖并患有许多疾病(效果)。

youdao

For example, if you eat 10 Mcdonald’s big-macs per day (cause) you are almost certain to end up obese with a host of illnesses (effect).

比如，如果你每天吃10个麦当劳的巨无霸（原因），你差不多必然会变得肥胖并患有许多疾病（效果）。

youdao

And then there's a final kind of toss-in effect, which is the host country effect.

NPR: Using Economics To Predict Olympic Medal Standings

But that's mostly the host country effect.

NPR: Using Economics To Predict Olympic Medal Standings

The sanctions, due to go into effect on Friday, will restrict Libyan organisations that hold stakes in a host of European companies, AP news agency reported.

BBC: Libya no-fly zone a UN decision, says Hillary Clinton