但是，对于初学者来说，循环结构的学习难度也是三大结构之最，较难掌握。
However, for beginners, the cycle structure of the three structures is the difficulty of studying the most difficult to master.
转变经济增长方式，在优化“三大结构”上纵深开发广东电力“第二资源”，全面建设资源节约型国民经济体系和资源节约型社会。
Guangdong Electricity sums up its novel four approaches: to find a way of growth, to explore a second resource, to set up a social system of saving and lowing energy consuming.
这座建筑用有如下（巨大）的结构：它有三大层，每层又分为不等的分层，每个大层有自己的功能和装饰氛围。
The building follows the structure of a (grand) house: with three levels, each spanning a varying number of split-level floors and each with its own atmosphere and purpose.
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