However, there are many different aspencts between CD-R and DVD-R, They both need perfect quality control.
尽管CD-R和DVD-R之间存在着很多的不同，它们都需要完善的品质控制。
2
The article took the DVD, CD-R and CD-W for examples, and then illustrated the testing methods and functions of the test media in the mechanical, optical and electronic performance tests.
I went to a computer shop and bought two DVD-R DL disc in case one if it fails to burn, at least I still have another one to try before going to shop and buy more DVD-R DL discs.
我去了一个电脑商店买了两个DVD - R DL的光盘案件之一，如果它未能烧伤，至少，我还有另外一个来尝试才去商店，并购买更多的DVD - R DL光盘。