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From: MDBG CC-CEDICT Chinese-English Dictionary 漢英字典

 化學需氧量 [ㄏㄨㄚˋ ㄒㄩㄝˊ ㄒㄩ ㄧㄤˇ ㄌㄧㄤˋ; hua4 xue2 xu1 yang3 liang4]
 chemical oxygen demand (an environmental indicator)
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