名词
中文翻译：Unknown
同义词：
['extreme outer', 'outermost extreme']
例句：
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1. The scientist discovered the outer extreme of the solar system.
科学家发现了太阳系的外极。
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2. The outer extreme of the ocean is often unexplored.
海洋的外极常常未被探索。
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3. The outer extreme of the mountain range was a treacherous journey.
山脉的外极是一次危险的旅程。