每日背誦第一期23
It is a fact that excessive herding of animals and exploitation of grasslands are responsible for the majority of dust storms. This means that dust storms are largely a result of human actions; in other words, they are controllable.
事實上，沙塵暴形成的主要原因是過度放牧及濫墾草原，這表明沙塵暴大多是人的活動所導(dǎo)致，也就是說，它們是可加以控制的。
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