当铺设，电路板被放置在子层的挤压，它在整个结构的跨度运行。
When laid, the boards are positioned on the sub-floor extrusion, which runs across the span of the structure.
当铺设一条从欧洲到美洲的海底电报光缆的时候，出于商业冬季人们第一次提出“海底是什么东西？”
The first transatlantic telegraph cable is completed, and messages begin to flow between the shores of America and Europe.
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