bottom temperature

例句：

1. 1.The bottom temperature of the lake is below freezing point.
   湖底的温度低于冰点。
2. 2.The bottom temperature of the ocean is around 25 degrees Celsius.
   海洋的底部温度大约是25摄氏度。
3. 3.The bottom temperature of the ice shelf is about -40 degrees Celsius.
   冰架底部的温度大约是-40摄氏度。