地球围绕太阳的运行轨道是椭圆形的。
The Earth's ___orbit around the Sun is elliptical in shape.
蝴蝶在花丛中盘旋飞舞，像在描绘无形的圆圈。
The butterfly was ___orbiting around the flowers, tracing invisible circles in the air.
月球绕地球运行一周大约需要27天。
The Moon ___orbits the Earth in about 27 days.
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