My daddy uses a special shellac on this thing.
我爸爸用了特殊的虫胶清漆。
However each side of these shellac discs could only play about 3 or 4 minutes of music, and record companies realized that if they wanted a longer playing record, they would need a tougher material, one that could handle smaller grooves.
而,这些虫胶光盘的每一只能播放大约3或4分钟的音乐,唱片公司意识到,如果他们想要播放更长的时间,他们需要一种更坚韧的材料,可以承受较小的凹槽。