在大多数情况下，使用软件产品的内置功能可以使将来的升级途径更容易一些。
In most cases, using built-in functions from the software products makes future upgrade paths easier.
据说，暴雪中途改变主意对单位进行了升级和改造，改进了他们与游戏内环境互动的途径。
That said, Blizzard has made changes in the way units are upgraded and altered and improved the way they interact with the in game environments.
升级一个运行时系统有很多途径。
There are a number of ways to upgrade a running system. The right approach depends on some factors
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