秋天用英语可以说作 "autumn"。这个词来源于拉丁语 "autumnus"，意为"秋天"。

例句：

I love the colors of the leaves in autumn. (我喜欢秋天树叶的颜色。)

The weather in autumn is often cool and pleasant. (秋天的天气通常凉爽宜人。)

I always associate the smell of bonfires with autumn. (我总是把篝火的味道与秋天联系在一起。)