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Lots of plants produce powerful toxins to deter pests .

许多的植物会生产威力巨大的毒素来防止害虫。

Moles also eat many lawn and garden pests .

鼹鼠还可以吃掉很多草坪和花园里的害虫。

Some consume live plants and are considered agricultural pests .

一些甲虫以植物为食，因此被认为是农业害虫。

The number of insect-eating species declines on open farms , where they help control pests .

食虫鸟类的数量在开放式农场有所减少，在那里它们帮助控制害虫。

Yields were rising , pests appeared under control and fertilisers were replenishing tired soil .

产量不断增加，害虫得到控制，贫瘠的土壤也补充了肥料。