模仿文本：But first, there is growing concern about the number of young Muslim men in Europe who risk becoming radicalised by joining militant groups, fighting in the Middle East and other conflict zones. But what pulls young people towards these extremist ideologies? Well, in 2009, Robb Leech discovered that his stepbrother Richard Dart had converted to an extreme form of Islam.

译文：欧洲年轻穆斯林人的数量越来越受到人们的关注，他们甘冒风险加入武装集团，战斗于中东和其他纷争地带，从而变得偏激。但是，到底是什么把这些年轻人拉向极端主义的意识形态的呢？2009年，罗布•里奇发现他的继兄弟理查德•达特早已皈依了一极为正统的伊斯兰教派。