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| 2,2-bis -l,1-dichloroethane; 2,2-bisp-chlorophenyl-1,1-dichloroethane | |||
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| 4,4'-dichlorodiphenyl dichloroethane | |||
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双对氯苯基二氯乙烷 : 2 phrases in 1 subject |
| Water resources | 2 |
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