引力透镜效应(注2)的产生是因为引力会改变光路，正如爱因斯坦提出的那样。
Gravitational lensing occurs because gravity, as Einstein showed, bends light.
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.
注：光地不配备任何设施，由参展商自备或委托组委会指定搭建公司设计、装修。
Note: the clearing ground provides no facility and is available for the exhibiter to appoint or entrust the organization committee to appoint a company for design and decoration.
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