Indian summer

名词 indian summer:

1. a period of unusually warm weather in the autumn
   同义词：Saint Martin's summer

1. Indian summer is a season which everyone looks forward to each year, but on whose exact arrival no two people usually agree.
   每年人人都盼望秋季的小阳春天气，但这一季节什么时候到来可就人人说法不一了。