drop-in tool

基本解释

A platform selection drop-down list box will appear in the main tool bar.
主工具栏中会出现一个平台选择下拉列表框。
In this article, you will not see the source code for that tool, but you will see the source code for two others--the create and drop tools.
在本文中，您看不到该工具的源代码，不过可以看到其他两个工具 —— 创建和删除工具的源代码。
The drag and drop comes in the form of a great plug-in called Drag and Drop Zones, but taking a few extra steps makes that tool much more powerful.
拖拽通过这款很棒的拖拽搜索地带（Drag and Drop Zones）插件就可实现，但额外多做几步就能使这个工具更加威力惊人。