Okay, the user wants me to translate "drainage basins" into Traditional Chinese. Let me check if the term is already in Traditional Chinese. The original term is in English, so I need to translate it. The correct translation for "drainage basins" in Traditional Chinese is "流域". I should make sure there's no existing Traditional Chinese content here. Since the input is English, I just provide the translation without any explanation. Alright, that's straightforward.
流域
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