We can do research on all these things, but there's another technology, which is extremely important.

我们可以研究任何需要研究的事物，但是还有个更重要的技术。

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Science, particularly more advanced sciences like physics or chemistry, are all about unobservables.

科学，尤其是像物理,或者化学这样较为尖端的科学，研究的都是不可观测的事物。

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But it's a different way of approaching things.

但这是研究事物的一种不同方式。

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So I am willing to introduce these ideas but A, because it's not my training and people who are focusing on cultural differences will do a much better job than I do; and second, because what I hope to look into is the universal, things are common across cultures.

所以我想介绍这些观点，但是首先，因为这不是我的专业,研究文化差异的人会比我做得更好;,其次，因为我所希望研究的是普遍事物，不同文化中普遍的东西。

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What this is, is you take a group of studies on an issue, you pool them all together, and then you weight studies differently depending on factors like how large they were, how good their methods were, and then you come out with overall estimates about the impact of something, in this case the Mediterranean Diet, on health outcomes.

所谓荟萃分析就是将某一问题的一组研究,汇总起来,并根据某些因素,赋予这些研究不同的权重,如基于研究的大小,研究方法的好坏等,然后得出关于某事物的影响的总体评估,在地中海式饮食中就是指健康结果

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