AI玩家将会升级他拥有的单位，并有不同的升级路线。
AI players will upgrade existing units with a variety of upgrades more intelligently.
对于Web 2.0而言，没有发行周期或升级路线，您总是使用最新的版本。
With Web 2.0, there is no release cycle or upgrade path; you are always using the latest version.
多种搭配，多种升级路线，在僵尸吃掉你的脑浆前赶紧利用它们找出求生之路！
Multiple upgrade options! Hurry, use them well to save your brains from zombies!
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