得到已经正常运转的代码是非常有用的，这样可以制定测试组件，来精确定义你到底要解决什么问题。
The existence of working code is a wonderful thing for setting up a test suite that defines what the problem you want to solve is, exactly.
尽管这些想法在实验的理论测试中运转正常，但是他们都有一个同样的缺陷：间歇运行。
Although all these ideas have been shown to work in theoretical tests on lab benches, they all suffer from the same handicap: intermittent operation.
工程人员讲到，要耗费几天时间去更换和测试开关盒，以确保燃料管道加热器正常运转。 上周五，仅在发射前几小时，“奋进号”飞船的发射被取消了。
Engineers say it will take several days to replace and test that switch box to ensure fuel line heaters are functioning properly.
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