An identification procedure of nonlinear unit feedback system is investigated by means of operator notation and Fourier transform, and some formulas for identification are given.

用算子符方法及傅里叶变换研究了单位反馈线性系统的一种辨识方法，并给出了辨识算式。

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This is why we use good design practices and automated feedback loops like unit or system tests; to keep things easy to change.

这就是为什么我们使用好的设计实践，和像单元测试与系统测试这样的自动化反馈环，都是为了让修改变得容易。

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Upon completing the code and the unit tests, the developer assembled a review package for the peer review process (described later) and awaited feedback.

在完成了代码和单元测试之上，开发人员要为同级评审过程(后面被描述)组装一个评审包并等候反馈。

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Newly-elected police and crime commissioner Paddy Tipping is asking for public feedback to see if the unit should return.

BBC: Mounted police

Within the world of consumer electronics, a smart marketing campaign can be relied upon to generate advance sales on the first batch of retail unit sales without relying on reviews or user feedback to drive demand.

FORBES: Microsoft Has A Problem With The Public's Expectation Of The Surface

When a unit is over, students take a test, move on, and receive feedback only weeks later.

FORBES: Building Motivation, Instilling Grit: The Necessity of Mastery-Based, Digital Learning