求翻译：手握水箱上水管，感觉逐渐升温；手握下水管，温度几乎不变。当水温达到80℃时，下水管开始逐渐升温，直至与上水管温度相同，手握有烫手的感觉。引擎继续运转，水温95℃左右时电动风扇开始运转，水温略有下降，约1分钟左右停转。如此反复，此系正常。是什么意思？

Holding tank on the water, the feeling is gradually warming up; hand under the water pipes, the temperature is almost constant. When the water temperature reaches 80 ° C, the water pipes under the gradually warming up, until the same temperature on the water, holding a hot feeling. The engine contin

Your hands feel on the water tank, water is gradually warming up into the hands of the water, the temperature almost unchanged. When the water temperature reaches 80 °