返回根项的句柄；否则返回NULL。

The handle of the root item; otherwise NULL .

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在进行这些修改之后，请运行脚本 migrate_base.pl，它会创建根项，并为 Hosts、Networks、Group 和 People 等创建低一级的组织单元

After making this change, run the script migrate_base.pl, which creates the root entry and the next lower level organizational unit entries for Hosts, Networks, Group, and People, among others

youdao

在一项实验中，他们向20名志愿者展示了各种物品的图片，并只让他们找到画有一根香蕉的图片。

In one experiment, they showed pictures of various objects to twenty volunteers and asked them to find just one of those, a banana.

youdao