In the first situation with fixed input, you're faced with the same sort of decisions as discussed in Which API?

对于输入固定的第一种情况，面临的问题和使用哪种API ？

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A test harness is an external program that works by applying a fixed input to selected classes and methods to see how they behave.

测试工具是一个外部程序，通过应用选定的类和方法，看他们的行为方式输入固定的工作。

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Because the noise sources have different values during each conversion, the ADC will most like produce different digital results for a fixed input.

因为噪声源在每个转换期间具有不同的值，因此adc将很可能对于固定的输入而产生不同的数字结果。

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If you can't commit to a fixed input process, you'll be missing out on keys made of heavy duty rubber.

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Second, the input-output model assumes fixed relationships over the time of the forecast horizon.

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