但有一个警告：启用优化意味着要增加编译时间——编译器尝试去做一些智能的事情，例如追随循环并分析出常量。
There is one caveat: turning on the optimization means that the build time increases. The compiler attempts to do clever things, such as following loops and pulling out constants.
常量应该使用驼峰格式（首字母大写）命名并且增加相关类的前缀。
Constants should be camel-case with all words capitalized and prefixed by the related class name for clarity.
同系列的，同周期的属于或是一系列有机化合物的，其中每一节都比相连的前一节增加一常量，尤其是ch 2组。
Belonging to or being a series of organic compounds each successive member of which differs from the preceding member by a constant increment, especially by an added CH2 group.
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