A soundsystem 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 soundsystem, 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 soundsystem, which was playing soft music, hoping to create a warm personal atmosphere for the speech.