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蜘蛛用多长时间消灭害虫？
How much time do spiders spend in killing insects?
youdao
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燕子能帮助农民消灭害虫。
Swallow can help peasants kill pests.
youdao
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我们必须动手消灭害虫。
We must take action in destroying the pest.
youdao
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我们必须动手消灭害虫。
We must take action in destroying the pest.
youdao