无热光

例句：

1. 1.The room was completely dark without any light source.
   房间完全黑暗，没有任何光源。
2. 2. The thermostat is designed to keep the room at a comfortable temperature, but it's notworking properly.
   恒温器被设计用来使房间保持舒适的温度，但它工作不正常。
3. 3.The sun is shining brightly, providing us with abundant warmth and light.
   太阳灿烂地照耀着，为我们提供了充足的温暖和光明。