In 1971, after Einstein's death, two scientists were able to carry out a crucial experiment.

爱因斯坦去世后，1971年，两名科学家完成了一项重要实验。

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A second experiment zoomed in on the age period of two to three years, to see how colour preferences changed during this crucial year.

第二个实验重点关注二到三岁这个年龄段，看在这个关键的一年颜色偏好是怎么变化的。

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A handful of bacterial genes crucial to survival were successfully replaced by artificial ones in a new synthetic-biology experiment.

在一项新的合成生物学实验中，为数不多的几个与生存性命攸关的细菌基因已经成功的为人造基因所替代。

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Knowing this direction was crucial to the experiment.

ECONOMIST: Neutrinos

The ocean is a single, contiguous body of water that is crucial to human life: an unauthorized experiment carried out in one place can have consequences hundreds of kilometres away.

UNESCO: MEDIA SERVICES

The crucial change is that HHS is saying they can experiment instead of complying with the law.

WSJ: Review & Outlook: Welfare Reform as We Knew It