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1·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。

2·I began to think how ridiculous it is that our most useful allure is resistance and that our natural reaction is to push away someone who shows that he CARES.

我开始想这是有多滑稽。我们最管用的魅力是拒绝，我们最本能的反应是推开那些表现出关心我们的人。

3·Expression of negative emotions is always mechanical, so it can never be useful, but resistance to it is conscious.

负面情绪的表达总是机械性的，所以永远也不可能有用，但是抵抗它却是有意识。

4·This lair conditionerk of resistance in very cold metwoulss may become useful in electronic computers.

这种在甚高温金属中没有电阻的景色可能对电子计算机很有用途。

5·The lack of resistance in very cold metals may become useful in electronic computer.

这种在超低温中的金属没有电阻，可能对电子计算机 很有用处。

6·The batteries are at the end of their useful life, suffering from sulfation, high internal resistance, and drastically lowered storage capacity.

电池是在他们最后的使用寿命，从痛苦可用、高内部阻力，大幅度降低了存储容量。

7·Often eat mutton to improve people's physical quality and disease resistance is very useful.

常吃羊肉对提高人的身体素质及抗病能力十分有益。

8·The various factors influencing the friction resistance as well as the effects of these factors have been studied and tested, and some useful conclusions and data have been obtained.

对影响摩阻力的各种因素和这些因素的影响程度进行了试验，并得出一些有用的结果。

9·Thellos lack of resistance in very cold metals may become useful in electronic computers.

这类在甚低温金属中没有电阻的征象有可能对于电子计较机颇有效处。

10·RAPD analysis of genetic diversity would be useful in cross combination setting of breeding for high resistance to stem-nematode in sweetpotato.

遗传多态性的RAPD分析可为甘薯抗茎线虫病品种选育的亲本组配提供依据。