名词
中文翻译：Unknown
同义词：
['sunspot', "sun's outer layer"]
例句：
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1. The full moon is the brightest part of the sky.
满月是天空中最亮的部分。
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2. The sun's corona glows with a warm light.
太阳的日冕发出温暖的光。
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3. The scientists observed the sun's corona during their research.
科学家们在研究期间观察了太阳的日冕。