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Sewerage systems are either'separate'or'combined '.是什么意思？

Sewerage systems are either'separate'or'combined '.

排水系统有 “ 分流制 ” 和 “ 合流制”.

相关词汇
sewerage systems are combined

sewerage

n. 污物处理（系统）；

systems

n. [物理化学]系( system的名词复数 )，制度，身体，系统；

are

vi. （用于第二人称单复数现在时，第一、三人称复数现在时）是；n. 公亩（等于100平方米）；

combined

adj. 结合的，<化>化合的，[数]组合的；v. （使）联合(combine的过去式和过去分词)；
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