作业精灵老师示例：
Spring is in March, April and May.
In spring, it's warm. We fly kites and go boating.
Summer is in June, July and August.
In summer, it's hot. We eat ice cream and go
swimming.
Autumn is in September, October and
November.
In autumn, it's cool. We climb mountains and
have picnics.
Winter is in December, January and February.
In winter, it's cold. We go skating and make
snowmen.
