We owe a lot to the birds and beasts who eat insects but all of them put together kill only a fraction of the number destroyed by spiders.
我们欠那些吃虫子的鸟兽很多，然而与蜘蛛相比之下，这些动物所消灭的虫子数量仅仅是蜘蛛的很少一部分。
We owe a lot to the birds and beasts who eat insects but all of them put together kill only a fraction of the number destroyed by spiders.
我们欠那些吃虫子的鸟兽很多，然而与蜘蛛相比之下，这些动物所消灭的虫子数量仅仅是蜘蛛的很少一部分。
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