Insecticide resistance genes are useful when there's insecticide about, but not when there isn't: then, they can be detrimental.
抗药性在有杀虫剂的地方有用，但是在没有杀虫剂的地方就没什么用了：有时甚至是有害的。
Children have weak resistance in defending this detrimental influence.
孩子们在捍卫这一不利影响的抵抗力弱。
Sulfur is also detrimental to welding performance, reducing corrosion resistance.
硫对焊接性能也不利，降低耐腐蚀性。
Sulfur is also detrimental to welding performance, reducing corrosion resistance.
硫对焊接性能也不利，降低耐腐蚀性。
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