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| 硬性洗涤剂 (不易生物降解者) | |||
| 硬性洗涤剂; 硬性洗涤剂经生物处理不能完全去除 | |||
| 硬性洗涤剂 | |||
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hard detergent : 4 phrases in 3 subjects |
| Chemistry | 2 |
| Oil / petroleum | 1 |
| Technology | 1 |
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