到19世纪中叶的时候，科学家对被称为电磁力这一现象中三个组成部分(指电、磁和光，译者注)已经有了相当的了解。
By the mid-19th century scientists had a fair understanding of each of the three components of electromagnetism, as the phenomenon has come to be called.
整个想法在第19世纪自从光被认为是无质量的、不受引力影响以来得到很少的关注。
The whole idea gained little attention in the 19th century, since light was thought to be a massless wave, not influenced by gravity.
第四纪沉积物的天然热释光中储存有自沉积以来的累积辐射剂量。
The natural thermoluminescence in Quaternary sediment has stored accumulated irradiated dose since the sediment deposited.
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