在回调函数中我也有些多余地为元素增加了id属性。
In my callback function I also add, somewhat superfluously, id attributes to my elements.
因此还要在回调方法中增加状态检查，如清单14所示。
Add another status check to your callback method as shown in Listing 14.
这些皱褶和沟回结构大大增加了新皮层的表面积，为数十亿的神经元提供了空间。
The folds increased the surface area available for the billions of neurons in the human neo-cortex.
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