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单词 curved arm
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Crash Course 天文篇

An amazing result was found: the locations of these nebulae indicated that the disk of the Milky Way was divided into SPIRAL ARMS — huge, sweeping, curving arms that were tens of thousands of light years along their lengths.

这些星云的位置表明银河系的圆盘被分成了旋臂——巨大的、宽的、弯曲的旋臂,有数万光年长。

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