1、Winter comes after autumn.
秋去冬来。
2、The fall of one leaf is enough to tell coming of autumn.
一叶知秋。
3、Nature is most colourful in autumn.
秋天, 大自然的色彩最为丰富。
4、What I like best is the autumn in Beijing.
我最喜欢的是北京的秋天。
5、On a lovely autumn evening we went out on a picnic.
在一个美好的秋夜,我们外出野餐。