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降雨在病害传播中发挥了重要作用。
动植物病害传播极快。
Disease of animal and vegetable pests propagate with extreme rapidity.
要在美洲种植橡胶树很难,因为有一种叫做“叶枯病”的病害存在,橡胶树的间距必须很大(译者注:防止病害传播)。
Growing Hevea in the Americas is hard. A disease called leaf blight means the trees have to be spaced widely.
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