彗星在圆形轨道上形成，但当它们冒险太接近行星时，就会被引力抛入现在的椭圆轨道。
Comets formed in circular orbits but were gravitationally flung into their present-day elliptical orbits when they ventured too close to planets.
它们可能接近圆形或者接近雪茄一样的瘦长形。
They may be nearly circular or so elongated that they take on a cigarlike appearance.
接近照片顶部尽头(即北部)，冰雪变得较稀少，但是左上角一个巨大的撞击陨石坑壁却为环形山底的一块椭圆形积冰提供了庇护所。
Toward the top (northern) end of the image, the ice becomes sparser, but the walls of a large impact crater in the upper-left corner provide a refuge for an oblong ice deposit on the crater floor.
那个圆形的闪电是如此的接近我，看起来如此的亮，难道是幻觉吗？
The circular lightning is so close to me, look so bright, is the illusion?
有一个小型、深色、坚固、圆形的物体被放在接近海滩的海里，但和早期推断不同的是，这并不是那个下落的物体。
A small, dark, stationary, spherical object is positioned in the sea close to shore, but contrary to earlier speculation, that is not the falling object.
圆度值等于1的生理性根尖孔形态为正圆形，大于1的为非正圆形，数值越接近于1形态越接近于正圆形。
A physiological foramen with roundness equal to 1 was defined to have a non-round instead of a round shape.
之后他们在计算机上对该“吞剑动作”进行仿真，最后得出结论：碳纳米管圆形端部的大小接近能够一口吞下的球状物尺寸，这类球状物是细胞通常吞噬的。
They then simulated that sword-swallowing maneuver on a computer. And they concluded that the round tips of nanotubes feel like bite-sized spheres, which cells commonly ingest.
之后他们在计算机上对该“吞剑动作”进行仿真，最后得出结论：碳纳米管圆形端部的大小接近能够一口吞下的球状物尺寸，这类球状物是细胞通常吞噬的。
They then simulated that sword-swallowing maneuver on a computer. And they concluded that the round tips of nanotubes feel like bite-sized spheres, which cells commonly ingest.
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