It might be a natural feature formation, or possibly a sunken, round man-made object. UFO Battles Captured on Video?

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。

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Foster's expatiation on "Flat Character" and "Round Character" could analyze the formation of the images.

福斯特关于“扁平人物”、“圆形人物”的阐述可以解析这类形象的形成。

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This article comments on the defect types, cause of formation of continous casting round billet and correlated measures for quality improvement.

评述了连铸圆坯常见的质量缺陷类型、成因及改善质量的相关措施。

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Then there is the perilous final round: the formation of the government, with all the attendant politicking and jockeying.

CNN: A VOTE FOR PEACE

But one of--a major constituent of comets, we believe, are stardust, interstellar grains, particles that formed 'round other stars and were the original seed of the star formation of the solar system.

NPR: Stardust Set to Deliver Comet Samples

The formation of the new Big East represents the latest round of musical chairs known as realignment a football-driven escapade that has broken up long-standing rivalries and traditions as schools chase the multi-billion-dollar riches that television networks desperate for DVR-proof programming are now willing to pay.

WSJ: Big East Conference Hits the Restart Button