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地球表面三分之二的面积被海洋覆盖,波涛汹涌的海浪下面是一个神秘莫测的世界。黑暗的海水是大大小小各种生物的家园。它们的生活环境受到气候、水温和洋流的影响。现在科学家们用卫星来探测洋流的变化,用声纳绘制海底的地址图片。