当您具有容易的方式来表达数值常量时，尤其是十六进制，就可以容易地构建对应于特定测试用例的标志，这是一种常见的编程技术。
When you have an easy way to express numeric literals, especially in hexadecimal, you can easily build flags that correspond to specific test cases, which is a common programming trick.
钢琴踏板在僵硬地、机械地上下移动，这是一种疯狂的、徒劳无功的运动，像花了二十六年时间堆起来的一堆大粪，不过却是准时完工的。
The pedal is moving up and down, stiffly, automatically, a crazy, futile movement, like a tower of dung that takes twenty seven years to build but keeps perfect time.
钢琴踏板在僵硬地、机械地上下移动，这是一种疯狂的、徒劳无功的运动，像花了二十六年时间堆起来的一堆大粪，不过却是准时完工的。
The pedal is moving up and down, stiffly, automatically, a crazy, futile movement, like a tower of dung that takes twenty seven years to build but keeps perfect time.
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