Grand Theft Auto: Episodes from Liberty City

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Grand Theft Auto: Episodes from Liberty City includes both
The Lost and Damned, and The Ballad of Gay Tony together on disc and does not require a copy of the original Grand Theft Auto IV to play. Now available for Xbox 360® and coming for PlayStation®3 and Games for Windows® - LIVE
on April 13th in North America and April 16th in Europe.

大概的意思是自由城插曲包含那个托尼之歌和夜生活两部资料片。
copy of the original Grand Theft Auto IV to play
复制到原版GTA4运行。意思就是说不是独立的，而是打在原版上的。
April 13th in North America and April 16th in Europe
美国时间4月13日。后面那个16日不知道什么意思。

我看官方网站的解释就是这样的，本人英语只考的到30分。所以错了请别喷我。