研究小组还将使用改变沙柱深度，在几个桶里添加生锈的钉子（增加病毒移除的效果），和改变其他参数等方式加以实验。

The group will change the depth of the sand column, add rusty nails to several pails (in an effort to increase virus removal), and alter other parameters.

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您可以设定xdebug . max_nesting_level参数来限定递归深度。

Parameter to limit the depth of recursion. For example, xdebug.max_nesting_level.

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通过比较清单2和清单3，可以看出处理程序处理了很多基本代码(比如循环和传递参数)，以便实现深度优先的搜索。

As you can see if you compare Listings 2 and 3, the processor takes care of much of the basic coding (such as looping and passing parameters) to implement a depth-first search.

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