名词
中文翻译：外层圆环
同义词：
['outer ring', 'outer layer']
例句：
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1.The outer corona is the first thing you see when you look up at the sky.
当你抬头看天空时，最先看到的是外层圆环。
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2.The outer corona contains a lot of dust and debris.
外层圆环含有大量的尘埃和碎片。
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3.The outer corona is responsible for the formation of the solar system.
外层圆环负责太阳系的形成。