Overly complex code is hard to test and maintain, which means it usually has a higher incidence of defects.

过于复杂的代码难以测试和维护，这通常还意味着更高的出错率。

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Aircraft shelter must have enough reliability, so it is necessary to test and maintain it periodically.

单机掩蔽库必须有一定的可靠性，所以必须对其进行定期的检测和维修加固。

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Knowing this, it makes sense that excessive conditionals are challenging to follow, and hence, hard to test and maintain.

了解了这一点，就会明白过多的条件会给以后带来麻烦，使测试和维护变得很困难。

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It could also spark a browser war, however, irritating corporate information-technology administrators who don't like the prospect of having to test and maintain competing browsers, says Tim Hickernell, associate lead research analyst with Info-Tech Research Group.

FORBES: The Web's Edge

Patients who enroll get a personal health account to maintain and share test results via email on a password-protected site.

WSJ: Image Share Program Seeks to Cut Down on Repeat Medical Scans

Thus the industry has for decades relied on a dense mud system to keep the hydrocarbons in the reservoir and everything that is done to maintain wellbore integrity is tested, and where a wellbore integrity test fails, remedial action is taken.

WSJ: The Oil Disaster Is About Human, Not System, Failure