Background: This 33.5-mile-long rail tunnel links the island of Honshu with the island of Hokkaido.

背景材料：这条33.5英里长的铁路隧道连接北海道与本州岛。

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Background: This 33.5-mile-long rail tunnel links the island of Honshu with the island of Hokkaido.

背景材料：这条33.5英里长的铁路隧道连接北海道与本州岛。

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