英语分级阅读 · Level 3 · environment · 约 85 词
Cities Plant More Trees to Cool Hot Streets
Many cities plant trees to lower street heat and help people walk outside in summer.
Urban heat islands form when dense buildings and dark pavement store sunlight and release it slowly at night. To reduce this effect, city planners are expanding street-tree programs along busy roads and school routes. Mature canopies can cut surface temperatures, improve walking comfort, and slightly support cleaner air. Success depends on more than planting day: soil quality, watering in the first years, and protecting trunks from cars all matter. When cooler routes connect parks, shops, and homes, outdoor life becomes easier during extreme summer weeks.
中文参考
当密集建筑和深色路面储存阳光并在夜间缓慢释放时，就会形成城市热岛。为减轻这一效应，城市规划者正在沿繁忙道路与通学路线扩大行道树计划。成熟树冠可降低地表温度、改善步行舒适度，并略微有助于空气清洁。成功不只靠种植当天：土壤质量、头几年的浇水，以及保护树干免受车辆碰撞都很重要。当更凉快的路线连接公园、商店与住宅时，极端炎热的几周里户外生活会更容易。