designing object-oriented software meaning in English

面向对象软件设计经典

Designing object - oriented software is hard , and designing reusable object - oriented software is even harder
设计面向对象软件比较困难，而设计可复用的面向对象软件就更加困难。
It ' s rather difficult to design object - oriented software , not to say a highly reusable one . the core of the problem is that only by several times reuse and modification can we reach the goal mentioned above
其原因在于：对于一个特定的设计，往往要经过好几次复用、修改的过程，才能使其具有较好的复用性和灵活性。