经过14个月的修理，这台巨型机器于周五晚上重新启动，晚上10点左右，第一束粒子波开始沿顺时针方向在隧道内环行。
After 14 months of repairs, the giant machine was restarted on Friday evening and the first beam started circulating in a clockwise direction around the tunnel about 10pm.
月球探测器上的激光高度计(LOLA)的工作原理为：发射一束激光脉冲，利用光学镜片将其分为五道光线，当光线到达月球表面后会自动反射至激光高度计上。
The lunar Orbiter laser Altimeter (LOLA) works by sending a laser pulse through an optical lense that splits it into five beams that are each scattered back after they strike the lunar surface.
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