What do u mean by break-in?Do u really want to wri somthing about criminals` break-in?That`s too professional.So please throw som light on it.I guess u just mean Invasion,eg Cultural Invasion,butnot b...我是用于英語口語課ppt用，主要還是側(cè)重如何防止被非法侵入，如何保護(hù)自己吧Got itI recommand you thishttp://www.google.com.hk/search?q=prevent+break-ins+&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:zh-CN:official&client=firefox-aand I think the first piece just meets your needsHere`s an article that may be of some help for you----if you want to teach your kids something like this. http://www.selfdefense-techniques.com/articles/Self-Defense-Techniques-How-To-Break-An-Attackers-Focus-In-A-Self-Defense-Situation.htmlWish you a success.