earth-moon line 地月线
An eclipse happens when the earth and moon are in line with the sun.
地球和月亮与太阳处在一条直线上，日食就发生了。
During an eclipse, the sun, Earth and moon line up, leaving a darkened moon visible to observers on the night side of the planet.
月全市发生时，太阳，地球和月球连成一线，地球夜晚一侧的观察者可以看到一个变暗了的月亮。
The last total lunar eclipse - when the sun, Earth and Moon are almost exactly in line, with the Moon and sun on opposite sides of the planet - was in February 2008.
上一次日食发生在2008年2月，当时太阳，地球和月亮完全在同一条直线上，月亮和太阳分别在地球的两边。
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