Unit tests test the Rails models, while functional and integration tests ensure the Rails application works as designed at a higher level.

对 Rails 模型进行单元测试，然后通过功能测试和集成测试在更高层次上确保 Rails 应用程序符合设计预期。

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If the technology works as designed, he says, it could spawn a new breed of aircraft engines capable of much higher speeds and performance.

他认为，如果能达到设计目标，这项技术就有望带来一种新的飞机发动机，而且在飞行速度和性能上都要强得多。

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And when it's applied, recycling generally works as designed, turning waste paper into fresh paper or old aluminum cans into new ones.

一般来说，回收按照预计得到实施是可行的，比如把废纸制成崭新的纸张，或者把废旧铝制易拉罐制成新产品。

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The blame does not lie with the doctors, it is our fault for designing an incentive plan that works as designed.

FORBES: How to Heal the Healthcare System

Other factors that contribute to false results are small sample sizes, studies that show weak effects (such as a drug which works only on a small number of patients) and poorly designed studies that allow the researchers to fish among their data until they find some kind of effect, regardless of what they started out trying to prove.

ECONOMIST: Just how reliable are scientific papers?