在编写头文件之前，我们需要引入一些额外的预处理器设施。预处理器允许我们自定义变量。
Before we write our own header, we need to introduce some additional preprocessor facilities. The preprocessor lets us define our own variables.
这些预处理标准旨在防止把那些公共设施不能适当处理或者损坏公共设施的废水排入公共设施。
These pretreatment standards are intended to prevent introduction of substances that cannot be adequately treated by public facilities or that might damage those facilities.
对以黄浦江为原水的水厂的工艺流程进行改造，即增加生物预处理和(或)活性炭后处理设施。
The waterworks, which takes raw water from Huangpu River, has to be improved either with raw water pre treatment or post treatment of output water by activated car...
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