A traditional flat-bottom boat sails off the island of Norr?ra in the Stockholm archipelago, where the holiday is celebrated best.
在斯德哥尔摩群岛，有一艘传统的平底船驶出诺劳拉岛，这里是节庆气氛最热烈的地方。
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All sailboats need a keel of board for this reason: the narrow, flat surface of the board or keel produces little drag when the boat moves forward but resists motion sideways.