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Ski tunnels or indoor ski arenas make it possible to do cross-country skiing year-round. Except for the shape of the building they are similar to Indoor ski slopes. The temperature inside the tunnel is kept at a constant temperature of a few degrees below zero Celsius to prevent snow from melting. ==Tunnels== 抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Ski tunnel」の詳細全文を読む スポンサード リンク
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