晴雨表

例句：

1. 1. The weather forecast is based on the readings of a weather vane.
   天气预报是根据风向标的指示得出的。
2. 2. The barometer has been falling since yesterday's storm.
   自昨天的暴风雨以来，气压一直在下降。
3. 3. The weather vane swings back and forth in the wind, indicating the direction of the wind.
   风向标在风中来回摆动，指示风的方向。