Summer is the second season in the year. In the Northern Hemisphere， summer goes from June to August. Summer is the hottest season in the year. Sometimes， the temperature reaches 40°C. Many people can not stand such hot weather. So they always stay indoors. At night， people [复习必备 | 海量免费学习视频资源尽在“学而思轻课APP”>>>点击了解
]would go out for a walk. Swimming is the most popular sport in summer. It brings cool to people.