遗传学作为一门科学已经存在150多年了，它为医学和历史学提供了强大的工具。
Genetics as a science has been around for over 150 years and has been a powerful tool for both medicine and history.
作为一门科学来给化学下定义就是，物质发生了化学变化，这种变化的结果就是不是有可能产生了新的物资。
We may define chemistry as the science in which we deal with the chemical change in matter as a result of which it is possible to form a new substance.
就如同一个画家在面对一张空白的画板时需要灵感一样，架构师们有时会视他们的工作为一门艺术而不是一门科学。
Just as a painter looks for inspiration when faced with a blank canvas, architects may also, on occasion, see their work more like an art than a science.
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