19. Nor were extinctions confined to large animals: small animals, plants, and insects disappeared, presumably not all through human consumption.
灭绝也不仅仅局限于大型动物:小型动物、植物和昆虫的消失,或许不是全部都由于人类的食用而消失。
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20. "Presumably it's because it's simple and easy to write a prescription and consider a patient case closed rather than investigate further," Polman says.
波尔曼说:“这可能是因为开处方很简单,也很容易,而且只考虑病人当前的情况,无需对其进一步检查。”
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21. The ancient Maya were presumably more experienced and did better, but nevertheless they too must have faced risks of crop failures from droughts and hurricanes.
古代玛雅人也许经验更丰富,做得更好,但他们也一定会面临干旱和飓风引起谷物歉收的风险。
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22. Debris thrown into the atmosphere by an asteroid collision would presumably contain large amounts of iridium, and atmospheric currents would carry this material all over the globe.
小行星碰撞后的碎片可能会含有大量的铱,而大气洋流会把这些物质带到全球各地。
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23. The ancestors of plants were photosynthetic single-celled organisms that gave rise to plants presumably lacked true roots, stems, leaves, and complex reproductive structures such as flowers.