A sound card gives a computer the capability to record and play sound files as well as video soundtracks.
声卡为计算机提供了录制与放映声音文件的功能，作用类似于录音带。
2
The soundtracks can alternatively be used to store 300 megabytes of digital data.
声道还可以交替地使用存储300兆的数据。
3
As all forms of mass media continue to expand, many movies, television programs, and commercials are continually including classical music in their soundtracks.