名词短语
中文翻译：Unknown
同义词：
["Douglas' system", "Douglas' method"]
例句：
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1. The Douglas line is a well-known geological feature in the Rocky Mountains.
道格拉斯线是落基山脉中一个著名的地质特征。
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2. This method of analysis is based on the Douglas line of reasoning.
这种方法的分析基于道格拉斯推理线。
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3. The team used the Douglas line to navigate through the dense forest.
该团队使用道格拉斯线来穿越密集的森林。