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light echo 【天文學】光反射〔由超新星爆炸所引起〕。

light engine

Nor , how the lightest echo of their united home , directed by herself with such a wise and elegant thrift that it was more abundant than any waste , was music to her 她以她的才智和品德勤儉地維持著他們共同的家,過著富裕而沒有浪費的生活。這個家的最輕微的回音不用說對她也都是音樂。