The basic concept of test-driven development is that before writing project code, you write a simple piece of code that tests your hypothetical project code for desired behavior.

测试驱动开发的基本概念是，在写项目代码之前，你写一段简单的代码来测试你假设的项目代码，以获得预期的反应。

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The overall concept and direction of the piece may be working great, but one element isn't.

一个作品的整体概念和方向也许是完美的，但其中某个元素也许并不完美。

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It? S simply the concept of mainline code that calls out to functions or subroutines that each implement an individual piece of a larger program.

它只不过就是调用函数或者子例程的主线代码的概念，其中每个函数或者子例程实现了更大的程序的一个单独的部分。

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But chemists are scrambling to turn the proof of concept into a working piece of electronics.

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The challenge for corporations is that a social license to operate is a subjective concept, not a piece of paper.

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It is a concept album, each piece is a progression through the innocence and playfulness of youth, the joys and sorrows of life as one gets older, spiritual awakening and finally death.

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