constant bar

例句：

1. 1. The temperature is constant throughout the day.
   温度在整个白天都是恒定的。
2. 2. The sun shines with a constant intensity.
   太阳以恒定的强度发光。
3. 3.The river flows constantly, never stagnating.
   这条河流不断流动，从不停滞。