不同之処：
It has been further finalized (new echos in it and stuff, like when Nicki says "Ke$haaa") and all the girls vocals have been balanced.
最终版本加入了人声回声 比如kesha的名字……
另外 三者人声更加融合
下载：http://hotfile.com/dl/115790517/1c13f5e/01_Till_the_World_Ends_(The_Femme_Fa.m4a.html
或者：http://www.britneychina.cn/bbs/read.php?tid=25803
