本周音乐主题：Let's plant tree
Trees help cleanse the air by intercepting airborne particles, reducing heat, and absorbing such pollutants as carbon monoxide, sulfur dioxide, and nitrogen dioxide. So we have to save and plant more trees
树木通过拦截空气中的微粒、降低热量、吸收一氧化碳、二氧化硫和二氧化氮等污染物来净化空气。所以我们要爱护树木哟，这次让我们用歌声来一次“植树游戏”吧！
