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| 河口 (河口区域，此处向海洋开口，淡水和海水混合产生咸淡水。河口环境有丰富的野生生物，特别是水生的。但是由于人类活动很容易受到破坏。) | |||
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estuarium : 3 phrases in 1 subject |
| Environment | 3 |
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