The advantage of biological control in contrast to other methods is that it provides a relatively low-cost, perpetual control system with a minimum of detrimental side-effects.

与其他方法相比，生物防治的优点是它提供了一种成本相对较低、有害副作用最小的永久性防治系统。

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This assumption is in sharp contrast to the decades-old traditional methods of developing mainframe applications.

这种假设与十年前开发主框架程序的老方法差异十分巨大。

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Such specialists, in contrast with their generalist rivals or ancestors, had the time and the incentive to develop better methods and technologies to do their tasks.

这些信奉术业有专攻的人们相较他们四面出击的竞争对手或先人来说，有时间也有动力去寻觅更好的方法和技术以达成所愿。

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In contrast, Business Week said, the lower-ranked undergraduate courses tended to still follow the older methods of having less business theory and more practical application.

CNN: Starting out young