It was the romantic--and by the way, about 3,300 miles of such canals would be built by the middle of the 1850s, all for the purpose of commerce, and to move people.
顺便说下,这是多么浪漫的事,在五十年代中期,为了商业运输和劳力流通,而建造的这类运河总长达3300英里
This slide shows one important feature of the physical chemistry of DNA that turns out to be very important for all of the technology that is built on DNA.
这张幻灯片展示了,DNA非常重要的理化特性,这些特性,对于所有以DNA为基础的技术很重要
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