isothermal period

例句：

1. 1. The temperature of the water in the bathtub is isothermal at 25°C.
   浴缸里水的温度是等温的，为25°C。
2. 2.The process of photosynthesis is isothermal, meaning that it doesn't change with changes in light intensity or temperature.
   光合作用的过程是等温的，意味着它不会因为光照强度或温度的变化而改变。
3. 3. During the summer, the soil is isothermal, meaning that its temperature remains constant throughout theday.
   在夏天，土壤是等温的，意味着它的温度在整个白天保持不变。