对世界各地的生物医学研究人员来说，双胞胎提供了一个宝贵的机会，来解开基因和环境——也就是先天和后天的影响之谜。

To biomedical researchers all over the world, twins offer a precious opportunity to untangle the influence of genes and the environment—of nature and nurture.

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人工草坪、田野或花圃等人文景观提供了裸露的土壤和缺乏竞争者的环境，是“机会主义者”的完美殖民地。

Human landscapes of lawns, fields, or flowerbeds provide settings with bare soil and a lack of competitors that are perfect habitats for colonization by opportunists.

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硬币的另一面同样是一种剥夺：对健康和幸福的剥夺，以及儿童失去了解当地环境的机会。

The other side of the coin is equally a deprivation: for health and well-being, as well as lost opportunities for children to get to know their local surroundings.

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The rest of human action, the rest of statecraft, will be really left to chance, luck, contingency, circumstances.

其余的行为，其余的施政方针，只能听命于,机会，运气，意外事件和环境了。

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