原文：
We missed this little gem just before the holiday break but Valve has released the promised add-on authoring tools for its smash hit sequel Left 4 Dead 2 (PC version only). There are two file packs that can both be grabbed via Steam, and while add-on designers will need both, players that simply want to check out the hard work of others will only need to grab the Add-on Support pack. The Authoring Tools pack will allow creative players to get to grips with director logic, gamemode logic, and will include Scavenger mode support. There's a tutorial to help folks get off the ground and a discussion email list which can be found here.
原文来自： http://pc.gamespy.com/pc/left-4-dead-2/1057815p1.html

Valve Releases its Left 4 Dead 2 SDK to the Community;是由提供的阀门新闻，中文译文仅供参考(上海日美阀门制造有限公司还生产 及全液控止回蝶阀，蓄能器式(紧急切断)快关蝶阀，气动通风蝶阀，电动式弹性座封闸阀，高真空蝶阀，欢迎您的选购。)
以下是参考译文：

译文：阀发布了承诺附加创作工具
我们失去了很多在假期休息，但阀发布了承诺附加创作工具，其红极一时续集造成4人死亡2（PC版，这个小宝石只）。有两个文件包都可以通过Steam将抓住，虽然添加设计者需要使用这两个，球员只是想看看其他人的辛勤工作将只需要抓住添加支持包。 创作工具包将允许创造力的球员去与导演逻辑夹具，游戏模式的逻辑，将包括清道夫模式的支持。有一个教程，以帮助人们从地面和讨论邮件清单，可以在这里找到。

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