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少儿朋友,你们一定知道蔡国庆是位著名歌星,可不一定知道他还是一位热心环保、为中国环保事业做了多年贡献的无名英雄。
Children friend, you must know that Cai Guoqing is a famous singer, may not necessarily know that he is also an avid hero who has made many contributions to environmental protection in China for many years.