Experts say the good news is humans will only get this effect if they drink coffee every now and then.Otherwise, the brain becomes "immune" to its positive effects.

专家说，好消息是：人们只是偶尔喝咖啡才能达到这个效果，否则，大脑会对此积极作用产生免疫。

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Experts say the good news is humans will only get this effect if they drink coffee every now and then. Otherwise, the brain becomes "immune" to its positive effects.

专家说，好消息是：人们只是偶尔喝咖啡才能达到这个效果，否则，大脑会对此积极作用产生免疫。

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A few other smaller studies in Europe have led to similar findings, but experts say the research only establishes a correlation between coffee drinking and brain protection.

欧洲其他一些较小的研究也有类似的结果，但专家们说，研究结果只是说喝咖啡与脑保护有关系。

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The coffee experts camped at a Christian missionary compound and trekked about six miles a day along narrow footpaths.

WSJ: The Indiana Jones of Coffee

That's why some coffee-industry experts favor expanding the varieties of coffee being cultivated and crossbreeding plants to strengthen them.

WSJ: The Indiana Jones of Coffee

Many factors are causing coffee's problems, experts say, including climate changes in some coffee-growing areas and population growth in Central America, which has led to pressure to convert coffee plots into housing and shopping malls.

WSJ: The Indiana Jones of Coffee