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.
20世纪初期人们开始致力于探索利用光束实现物体光致旋转的方法。
In the early 20th century the people began to devote using the laser to achieve optical rotation method.
测定碎屑矿物沉积后吸收的古剂量是第四纪沉积物热释光测年的关键。测定古剂量的方法有三种，即部分晒退法、残余热释光法和再生热释光法。
Determination of the paleodose absorbed by debris minerals in sediments after deposition is a key course for TL dating of the Quaternary sediments.
从李四光教授对地层古生物、第四纪冰川和地质力学三方面的研究，来介绍他的学术思想和科研成果以及他的地壳运动的理论。
The paper gives an introduction of Li Siguang's academic thought and achievements in three aspects, on stratigraphic paleontology, Quaternary glaciology and geomechanics.
从李四光教授对地层古生物、第四纪冰川和地质力学三方面的研究，来介绍他的学术思想和科研成果以及他的地壳运动的理论。
The paper gives an introduction of Li Siguang's academic thought and achievements in three aspects, on stratigraphic paleontology, Quaternary glaciology and geomechanics.
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