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①围绕……旋转
②数百万的
③太阳系
④在宇宙中
⑤到目前为止
⑥几次
⑦足够远
They spent yuan building the bridge.
How many planets in the universe the sun?
They agree with this travel plan.
Neptune is the eighth planet in our .
The child is look after himself.
outside; for; on; to; like
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