科学家表示，欧洲一些品种的老鼠通过与完全不同的品种杂交，对最有力的害虫防治方法产生了抵抗力。
Scientists say some European species of mice have developed resistance to the strongest pest control by crossbreeding with an entirely different species.
虽然 Fly-Away 收取的价格低了不少，但我们省钱的最好方法还是回到 Buzzoff，进行所有的害虫防治服务。
Even though the price charged by Fly-Away is considerably lower, our best means of saving money is to return to Buzzoff for all our pest control services.
利用昆虫病毒防治害虫是生物防治的一种有效方法。
It is an effective method of biological control to use insect virus to prevent pest.
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