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最新讲座的海报、录像和PPT


第五册第二课【海为什么是蓝色的】课堂教学用材料

图片欣赏
太阳光谱图



蓝色的海



绿色的海




The colourful shots (pictured) were taken by Melissa Rensen,
51, as she flew over the Caribbean Sea.














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