Having a pitch corresponding to a relatively small number of sound-wave cycles per second. 低音的与一相对少量的每秒钟音波周期相对应的低音的
At this school, only ten people passed the music examination this year. That may seem a small number but it's(about) par for the course. 今年这所学校只有10人通过了音乐考试。人数看来太少了，但这却是意料之中的事。
