autumn begins

例句：

1. 1. The leaves change color in the fall.
   秋天树叶变色。
2. 2. Autumn is a beautiful time of year.
   秋天是一个美丽的季节。
3. 3. We celebrate the harvest by gathering with family and friends during the autumn.
   我们通过与家人和朋友团聚来庆祝收获的季节。