这是十分基本的。这仅仅判断ISBN编号的值是否为空的，同时在导航栏上禁用除删除控件外的所有其它控件-如果ISBN编号不为空的话，启用全部控件。

Basically, this just determines whether or not the ISBN value is empty, and disables all of the viewer controls except Delete if so - otherwise, it enables them all.

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由于该地区除木材以外，所拥有的自然资源十分稀少，当地人自然擅长于用木材进行加工。

Since this area possessed few natural resources except wood, the locals naturally became very adept at working with the stuff.

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除局部任务和服务之外，子流程也可以成为较大流程的一部分。

In addition to the local tasks and services, sub-processes can also become part of a larger process.

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