水下物体运动引起扰动，会在海面产生尾迹。
Submerged moving bodies may present some wake features on ocean surface.
当水下物体反射声波时，我们可以清楚地看到它的三维图像。
When the object underwater reflects the sound wave, we can clearly see its shape in the form of a 3-dimensional image.
声纳：利用声学方法侦测或测定水下物体的距离和方向的技术。
Sonar :Technique for detecting and determining the distance and direction of underwater objects by tracking acoustic echoes.
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