Biochemical oxygen demand over five days - BOD5: The standard biochemical oxygen demand test whereby a sample of the liquid is incubated at 20 degrees C for five days.
五天生化需氧量（简写为BOD5）：标准的生化需氧量试验。其方法是把一份溶液的样品在摄氏20度下培养五天。
The two methods used for measuring standard samples and all sewage biochemical oxygen demand.
用上述两种方法测定标准样品、各种污水的生化需氧量进行差异性比较。
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