15. Whereas atmospheric storms arise in a matter of hours and last for days, magnetic tempests develop over decades and persist for centuries.
大气风暴出现在几小时内，持续几天，而磁暴形成要几十年，持续几个世纪。
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16. The earliest humans arrived several million years ago, but only 150,000 to 200,000 years ago, did cultures, language, religion and the arts arise.
人类最早出现在几百万年前，但直到15万到20万年前，才出现了文化、语言、宗教和艺术。
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17. Another urge or need that these gardens appear to respond to, or to arise from is so intrinsic that we are barely ever conscious of its abiding claims on us.
18. Their allele frequencies at numerous genetic loci gradually become more and more different as new alleles independently arise by mutation in each population.
随着新等位基因在每个群体中独立突变产生，它们在许多遗传位点上的等位基因频率逐渐变得越来越不同。
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19. We do not even know, for example, how many stars have planets, and we certainly do not know how likely it is that life will arise naturally, given the right conditions.
20. When several individuals of the same species or of several different species depend on the same limited resource, a situation may arise that is referred to as competition.
当同一物种或不同物种中的几个个体依赖于同一有限的资源时，就会出现所谓的竞争的情况。
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21. In times of emotional turmoil, remember that emotions arise because your senses are wired to the primitive part of your mind which is self-regulated, autonomous and spontaneous.
