在上载过程中，长时间播放的视频的速度的持续下降是很明显的。
During uploading, the continuing decrease in speed of a long-playing video was significant.
早在1948年的6月，哥伦比亚唱片公司就成功引进了第一张可供留声机长时间播放的密纹唱片。
Columbia Records introduced the first successful microgroove long-playing phonographs way back in June 1948.
目前便携式MP3播放器一般采用非易失性存储芯片作存储器，容量小、单位成本高，且不适应长时间播放。
Portable MP3 player generally adopts the nonvolatile storage chip to make the memory at present, the capacity is small, the unit has high costs, and does not adapt to play for a long time.
应用推荐