(单词翻译:单击)
Officials from the local government said that they had invested 2 billion yuan to protect the environmental conditions. The central government had also invested a large sum of money to improve the ecological4 system of the Yellow River.
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1
delta
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| n.(流的)角洲 | |
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2
migratory
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| n.候鸟,迁移 | |
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3
annually
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| adv.一年一次,每年 | |
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4
ecological
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| adj.生态的,生态学的 | |
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