要这样做，需要确保当XML元素包含子元素时，子元素包含与父代主键相对应的外键。
To do that, we need to make sure that when an XML element can contain a subelement, the subelement contains a foreign key corresponding to the parent's primary key.
我没有按通常作法将错误代码返回给父代应用程序，而是将错误打印到屏幕，然后退出程序。
Instead of gracefully returning an error code to the parent application, I print the error to the screen and bail out of the code.
对达尔文来说，造成子代表型和父代表型存在差异的因素中，生物自身所起的唯一作用就是随机突变。
For Darwin, the only thing that organisms contribute to determining how next-generation phenotypes differ from parent-generation phenotypes is random variation.
遗传算法中的交叉算子最根本的作用就是要使子代继承父代的优秀基因。
The main function of cross operator in the Genetic Algorithmsis to make the offspring inherit excellent gene from the parents.
因此，删除父代码组将破坏已在其子层次结构中定义的所有安全行为。
Therefore, deleting a parent code group destroys any security behavior that was defined in its child hierarchy.
例如，您可以让操作位置相对于接收操作事件之项目的父代。
For example, you can make the manipulation positions relative to the parent of the element that receives the manipulation events.
它同成熟的父代中心粒有相同的结构，但仅仅是父代中心粒长度的一半。
It has the same structure as the mature parental centriole, but is only about half its length.
如果代码是父代码组的成员，则该代码可以是该组的一个或多个子代码组的成员。
If code is a member of the parent code group, then the code might be a member of one or more of that group's child code groups.
如果程序码不是父代程序码群组的成员，就不可能是继承自该父代的任何程序码群组的成员。
If code is not a member of the parent code group, it cannot be a member of any of the code groups that are descended from that parent.
如果程序码不是父代程序码群组的成员，就不可能是继承自该父代的任何程序码群组的成员。
If code is not a member of the parent code group, it cannot be a member of any of the code groups that are descended from that parent.
应用推荐