The first time that the question 'what is at the bottom of the oceans' had to be answered with any commercial consequence was when the laying of telegraph cable from Europe to America was proposed.
第一次从商业价值的角度来回答海底有什么这个问题，是在有人建议铺设一条从欧洲到美洲的电报电缆的时候。
The first time that the question "What is at the bottom of the oceans?" had to be answered with any commercial consequence was when the laying of a telegraph cable from Europe to America was proposed.
“海底有什么？”这个问题第一次必须加以回答是在考虑铺设从欧洲到美国的电报电缆的时候，而且具有商业意义。
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