黑河中游是我国西北干旱区开发历史较早，绿洲化程度较高的第二大内陆河流域。

The middle reaches of Heihe river is the second largest inland valley in the arid region of northwestern China.

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黑河中游是我国西北干旱区开发历史较早，绿洲化程度较高的第二大内陆河流域。

The middle reaches of Heihe river is the second largest inland valley in the arid region of northwestern China.

youdao