Scientists think that some parts of our brains can grow stronger if we use them a lot.For example,they found that parts of a taxi driver's brain got stronger because he had to memorize all the streets in a city!However,if we do not use our memory regularly,our brains can also get weaker.We need to exercise our brains just like we need to exercise our bodies!请高手指教这一段怎么翻译呀?