用英语介绍一下奥林匹克运动会的不利之处

Most people may think there is nothing bad for the Olympic games to hold. Unfortunately, with the terrorism now becoming the major threat to many countries' national security, it's getting more and more clear the Olympic games could be taken use as a good stage for a successful terrorist attack on innocent people. Therefore, higher investment has to be made to build up a more secure safety system, which could become a economic burden for the host country as a result.