原文：The efforts that have been made to explain optical phenomena by means of the hypothesis of a medium having the same physical character as an elastic solid body led, in the first instance, to the understanding of a concrete example of a medium which can transmit transverse vibrations, and at a later stage to the definite conclusion that there is no luminiferous medium having the physical character assumed in the hypothesis.0RI答案窝(daanwo.com)-大学生作业答案及考资分享平台

译文：解释光学现象的努力靠假定有一种具有与弹性固体相同的物理性质的介质完成。这种尝试的结果，最初，具体结论的得出是人们以为有一种能传输横向振动的媒介,那种物理性质的发光媒介并不存在。0RI答案窝(daanwo.com)-大学生作业答案及考资分享平台