从那时起，便对这个术语进行了概括，目的是形成一种Web应用程序的概念和趋势。
Since then, the term has been generalized to form an umbrella of concepts and trends that characterize a style of Web applications.
作为一个类比，就像在形成万有引力定律之前，必须有“加速度”和“重力”的概念，而且必须有对这些概念的广泛接受的度量方式。
As an analogy, before a law of gravitation could be formulated, it was necessary to have the concepts of 'acceleration' and 'weight,' and there had to be commonly accepted measures of these terms.
春秋战国以后随着铁制农具的出现，农业生产对季节性的要求更高了，就逐渐形成了节气的概念。
During the Spring and Autumn Period, the agricultural production was highly subject to the seasonal changes with the invention of iron tools, thus forming the concept of Solar Term.
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