地月系统一直令人困惑。

The Earth-Moon system has always been perplexing.

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照片中，地月系统实际上看上去像一颗双行星。

In this picture, the Earth-moon system actually appears to be a double planet.

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照片中，地月系统实际上看上去像一颗双行星。

In this picture, the Earth-moon system actually appears to be a double planet.

youdao