It was set up comprehensively as far as Song Dynasty.Dongjing is the most emblematical deputation.

可以说，经过隋唐五代逐步开放，直到北宋期，才城市中有了广泛，当都城东京是最为典型代表。

He learnt the rules of the game step by step.

他逐步学会了游戏规则。

The British present political system has evolved over several centuries.

英国现行政治制度是经过几个世纪逐步发展而成。

The story unfolds as the film goes on.

情节随着影进展逐步展开。

The program to phase down waste in natural sources is progressing successfully in the country.

逐步减少自然能源浪费正这个国家顺利进行。

Urban disaster science is a new discipline having been uprisen with theindustrial development.

城市灾害学是一门随着工业化发展而逐步产生一门新学科。

Meanwhile, certain defects related to the intrinsic problems and inadaptability of this system begin to appear under the new historical conditions.

，新历史条件下，因信访制度中存缺陷和不适应性而产生弊端逐步显现。

Etesian Qingdao interenational seawater desalination conference had broad influence and famousness,and it becomes a famous international conference brand step by step in China.

这一年一次青岛海水淡化国际会议业内已有很大影响力和知名度，逐步发展成中国一个知名国际会议品牌。

So the bumpiness, the rising high altitude, and the long duration of these two things made this short distance of the road the toughest.

崎岖不平道路，逐步升高海拔，和很长持续间使这段路程成为了最艰难一段。