正文

NASA Responds to Viral 'UFO' Video(翻译)

2016-07-19来源:VOA

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Words in This Story

regularly - adv. at the same time every day, week, month, etc.

range - n. the distance over which someone or something can see, hear, or reach someone or something else

debris - n. the pieces that are left after something has been destroyed

reflection - n. an image that is seen in a mirror or on a shiny surface