采用面向对象的方法构建部件单元库，能在不改变系统结构的条件下对部件单元库进行扩充。
The part element library was constructed by object-oriented method and could be extended without changing the system structure.
我在这里并不是要为里克·佩里站台，不过他说的显然是真理：人口结构会发生改变，不可能每一代人都能从这个系统中拿到比自己所付出的还要多的钱。
I am not here to endorse candidate Rick Perry, but the point of his charge is obviously true: each generation can't keep taking more out of the system than it put in, once the demographics change.
他们提供的代码范围包括，从补丁到结构化的内核改变，从文件系统和国际化工作到GPL ' d驱动程序。
They contribute code ranging from patches to structural kernel changes; from file systems and internationalization work to GPL'd drivers.
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