Original sentence: China Blue High-Definition (CBHD)(Chinese:中国蓝光高清光盘), formerly known as CH-DVD (China High Definition DVD), is a high definition optical disc format announced in September 2007 by the Optical Memory National Engineering Research Center (OMNERC) of Tsinghua University in China
Edited sentence: China Blue High-Definition (CBHD) (), formerly known as CH-DVD (China High Definition DVD), is a high definition optical disc format announced in September 2007 by the Optical Memory National Engineering Research Center (OMNERC) of Tsinghua University in China