1. They were almost knee-deep when they realized it was a hot spring。 当他们意识到这是一个温泉时，水已齐膝深了。
2. They were almost knee-deep when they realized it was a hot spring. 他们意识到这是一个温泉的时候，水已经齐膝深了。
3. Thanks to a hot spring almost 40m below ground, the temperature of the lake never dips below 23C. 得益于地下40米深处的温泉，即使在冬天，湖水的温度也从未低于23摄氏度。
4. It is a kind of hot spring water, which contains the mineral base, to restore and transform it into weak alkaline water. 它是一种温泉水，含有矿物基质，来使它还原转化为弱碱性水。
5. The tiny plant is known as the 'thermal water lily' because it was discovered growing in the muddy edges of a freshwater hot spring. 这种小植物的睡莲叶只有一厘米宽，因为它被发现生长在淡水温泉的泥泞边缘。
