Harnessing Adaptability 这一章就是在全方位的展示大脑的适应能力（degree 和 variety）。
把 MRI作为验证标准，围绕 how the brains of people with particular skills differ from the brains of people without 展开一系列研究。
出租车司机和公交车司机 运用大脑的特点，呼应了mechanical repetition 和 purposeful practice 区别。出租车司机的任务是有挑战性。require anything relevant to the trip 并且需要在大脑里内化internalize整个伦敦地图，灵活运用。
为了排除其他因素的干扰，在设计实验时特别控制了其他contols。其中包括证明确实是training 改变了大脑结构 而不是 先天性的大脑优势。
写作亮点：
This idea went hand in hand with the belief that individual differences in abilities were due mainly to genetically determined differences in the brain’s wiring and that learning was just a way of fulfilling one’s genetic potential.
伴随着这种观念的还有人们对于...的理解。
字词：
One-way streets abound, there are traffic circles and dead ends all over, and through the middle of everything runs the Thames River.
■abound
很简洁的词，可以替换there are many...等。尤其作为引言来描述背景时，读来上口。
第一种搭配是：为数众多的事物（具体或抽象均可）作为主语。【例如】Rumours abound.谣言纷起。另一种搭配则是：承载的载体（具体或抽象均可）作为主语，为数众多的事物（具体或抽象均可）用with或in引入。【例如】The hills abound with streams and waterfalls. 丘陵上面有许多溪流和瀑布。/ History abound with examples. 历史事例很多。/ London abounds in public monuments.
造句：Xi'an as the capital city of many dynaties in ancient China abounds with historic sites.
That still left one loose end, however: perhaps the taxi drivers in the studies had started out with larger posterior hippocampi
loose'end
◙noun[usually pl.]
• a part of sth such as a story that has not been completely finished or explained
(故事等)悬念,未了结的部份,未交代清楚的情节:
»The play has too many loose ends.
这部剧未作交代的东西太多。
»There are still a few loose ends to tie up(= a few things to finish).
还有几件小事需要了结。
Most scientists would have flat out denied that something like what Maguire has seen in the brains of London cabbies was even possible.
flat out 竭尽全力；坚决的
1.as fast or as hard as possible
•Workers are working flat out to meet the rise in demand for new cars.
2.(especially NAmE)in a definite and direct way;
•I told him flat out ‘No’.
•It's a 30-year mortgage we just flat out can't handle.