名词
中文翻译：自然边界
同义词：
['natural limit', 'natural demarcation']
例句：
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1. Thenatural boundary between the forest and the lakeis very clear.
森林和湖泊之间的自然界限非常清晰。
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2. The researchers found that thenatural boundary between species could be influenced byhuman activities.
研究人员发现物种之间的自然界限可能受到人类活动的影响。
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3. Theboundary between urban and ruralareas is becoming increasingly blurred.
城市与乡村之间的界限正变得越来越模糊。