开头：there are four seasons in a year .Namely spring,summer,autumn and winterSpring is warm ......
Summer is the hottes all year roud(夏天是一年四季中最热的).......Autumn is very cool,but also the harvest season（秋天十分凉爽，也是丰收的季节）............... ln contrast with the summer and winter is the coldest season,and sometime snow(冬天恰好与夏天相反
