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按照区域梯度理论应该发生的先发区域边际产业向后发区域的大规模转移，却没有按照预期的发生。
According to gradient theory early-developing regions should have mass transfer from early-developing regions to late-developing regions, but it does not happen as expected.
在地中海区域的早期文明中，拱形结构主要被运用在地下排水管上，但在地上建筑中首先发展并广泛使用拱门的是罗马人。
The arch was used by the early cultures of the Mediterranean area chiefly for underground drains, but it was the Romans who first developed and used the arch extensively in aboveground structures.
另一些人则认为这是由于由于儿童发育太快，也许大脑中的一些区域比其它区域发育更快，或者某些部分是优先发育的。
Other propose that since children develop so quickly, perhaps some areas of the brain outpace others in development, or certain aspects of development take precedence.
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