Listening practice: Why a comet suddenly became 20,000 times brighter
High School English Listening Practice.
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High School English Listening Practice.
outburst:爆发,指彗星亮度突然增加的事件periodic:周期性的,会沿着规律轨道返回coma:彗发,包围彗核的发光气体和尘埃云dust tail:尘埃尾binoculars:双筒望远镜nucleus:彗核,彗星的固体中心subsurface gas:地下气体,聚集在表面下方的气体comet quake:彗星震动,指彗星内部物质突然移动或破裂fade:逐渐变暗Two surprising outbursts made the comet about twenty thousand times brighter than usual.two outbursts made the comet brighter,意思是「两次爆发让彗星变亮」。about twenty thousand times brighter than usual 是和通常亮度比较,表示「大约亮了两万倍」。could 和 possibility 都提醒我们,不要把解释写成已经证实的结论。science.nasa.gov
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