这种形状可能是由一种自然特征所形成，或者也可能是一个沉没在海底的圆形人造物体。
It might be a natural feature formation, or possibly a sunken, round man-made object. UFO Battles Captured on Video?
我们可以看到，现在的湖底或浅海底部的沉积物中形成了波痕。许多沉积岩都含有类似这种波痕的特征。
Many sedimentary rocks contain such features as ripple marks, exactly like those we can see forming in sediments at the bottom of present-day lakes or shallow seas.
该图反映路由区海底所有的自然环境特征。
These maps can reflect all submarine environmental features in the cable route area.
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