Relevant data shows that, in our country, the prices of cars only account for about 60% of the total cost, and the rest 40% are various taxes and fees, whether they‘re reasonable or not.
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Listing 11 shows how you might add a "prototype" entry to your data instance, and then add binds to make that last entry always non-relevant.
清单11显示了您可以怎样将“原型”项添加到您的数据实例中，然后添加绑定使最后这项永远不相关。
Listing 10 shows one approach, which is to bind the "Delete" trigger to a node in the data model, and then to make that node non-relevant when the count of nodes in the set reaches 1.
清单10给出了一种方法，那就是将“删除”触发器绑定到数据模型中的节点上，然后在节点集中的节点数达到1时使该节点变为不相关。
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