冰河世纪的开始(结束)是因为地球与太阳成一直线的变化。
Ice ages begin (and end) because of variations in the Earth's alignment with the sun.
当太阳、地球和月球成一直线且地球遮挡了太阳照到月球上的太阳光。
Lunar eclipses occur when the sun, Earth and moon sit in alignment and the Earth blocks sunlight from reaching the moon.
根据今年夏末的一项“职业者”调查报告显示，10个雇员之中就有4个声称他们的工作压力在最近的六个月来一直成直线上升趋势，同样，10个之中就有2个声称自己已经感到精疲力竭了。
Four in 10 employees say their work stress level has increased in the last six months, according to a CareerBuilder survey from late this summer. Two in 10 feel burned out.
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