该研究表明全世界大约有 2 千万公顷的农田使用这种方式灌溉。
The study estimates that some 20m hectares around the world are watered in this way.
该研究表明，地球上各个群体的遗传印记深入且明显，不会轻易被时间磨灭。
The research shows that populations' genetic footprints on the planet are deep, sharp and not easily covered over by time.
该研究表明黑猩猩只是将他人视为社会工具，一个可以使自己利益最大化的工具。
The study implies that chimpanzees view others as social tools, as a means of maximizing their own rewards.
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