但是，就总体的科学研究而言，19世纪应被视为科研结构发生变化的关键时期。
In science generally, however, the nineteenth century must be reckoned as the crucial period for this change in the structure of science.
在科学界的过往研究中，所有生命体都是使用磷来建立DNA结构的。
Every living thing that scientists have ever studied uses phosphorus to build the backbone of its DNA.
经过了超过十二年的研究工作，科学家们已经完成了一种导致普通感冒的病毒的3 - D原子结构示意图。
After more than a decade of work, scientists have completed a 3-d atomic-scale map of a virus that causes the common cold.
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