The island is roughly circular in shape.
这个岛屿大致是圆形的。
And it shifts its orbit from being roughly circular to more elliptical on a 100,000-year cycle.
并且它的变轨周期是10万年，从近似的圆变得更椭圆。
Sunspots are relatively cool, dark features on the sun's surface that are often roughly circular.
太阳黑子是太阳表面相对较冷较暗的，大致呈圆形的区域。
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