在只有趁着每天退潮那几个小时步行前往的博赛镇（BroughofBirsay），我们在一个标着维京桑拿浴场的洞穴里出了点汗。
At the Brough of Birsay , accessible only by foot during the few hours when the tides recede , we sweated in the chamber marked the Viking sauna .
维京洞穴