1. A sound system of law enforcement is necessary because poorly enforced laws cause crime and violence. 我们有必要创造一个健全的执法体系，因为执行不力的法律会带来犯罪和暴力。
2. By installing the new sound system, the Student Association hopes to attract more students to the movies and increase ticket sales. 学生协会希望能通过安装新的音响系统来吸引更多的学生观看电影，并增加票房收入。
3. Just before people began entering the hall, Larry dimmed the lights and turned up the sound system, which was playing soft music, hoping to create a warm personal atmosphere for the speech. 就在人们开始进入大厅之前，拉里调暗了灯光，打开了音响系统播放轻柔的音乐，希望为演讲创造一个温暖的私人氛围。
4. Multiroom sound system? 多区域音响系统？
5. Your car's sound system is amazing. 你的车载音响系统实在太震撼了。
