她试图去检验这样的理论：由于狮群之间斗争的惨烈，当听到大量入侵狮子的吼叫声之后，狮群除非在自身数量占优势，通常都会选择撤退。

She wanted to test the theory that, since fights between lions are very costly, when lions heard large Numbers of intruders' roars they would withdraw unless they were in superior Numbers.

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但是他们肯定比今年的毕业生有更好的机会，这些毕业生首先必须与他们课堂上所学的宏观经济理论的现实意义作斗争。

But they may stand a better chance of doing so than this year's graduates, who must grapple at first hand with the practical implications of the macroeconomic theory they learnt in class.

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咖啡有个特性，在理论上，它同时能够提高和减低健康风险，即可能潜在地增加胆固醇在同于心脏病有关的炎症中作斗争的同时。

Coffee has properties which could in theory simultaneously increase and reduce risk - potentially raising cholesterol while battling the inflammatory damage associated with heart disease.

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