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Saturn is the most inside rock core, its diameter is 2 million meters.
土星最里面是岩石核心，其直径有2万千米。
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Large INSIDE DIAMETER: the large end of the cup raceway.
外圈小端内径：外圈滚道面较大一端。
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Large INSIDE DIAMETER: the large end of the cup raceway.
外圈小端内径：外圈滚道面较大一端。
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