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| 主要沉淀物 | |||
| 原〔始〕污泥 | |||
| 一次污泥指初沉池的污泥 | |||
| 初级的污泥 | |||
| 原生污泥 | |||
| 原污泥; 原始污泥; 初次污泥; 初沉污泥; 初沉池污泥 | |||
| primary sludge: 5 phrases in 1 subject |
| Technology | 5 |
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