它们并非经常发生，大约只有一年一次，因为太阳，月亮的轨道相互倾斜，它们很少能排成一条直线。
They don't happen often-only about once a year-since the tilted orbits of the sun, moon, and Earth make their alignment rare.
这幅图片从黄道平面的视角捕捉到地球、月球和太阳排成一条直线的瞬间画面。
This image captures a momentary line-up looking out along this fundamental plane of our solar system.
在一个漆黑的夜晚，法拉格特率领他的17艘战舰排成一条直线向前进发。
One dark night, Farragut led seventeen Union warships up the river in a line.
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