将下拉菜单触发器（dropdown-toggle）和下拉菜单（dropdown-menu）都包在.dropdown里，或者另一个生命了position:relative的元素。
基于4个网页-相关网页
dropdown menu 下拉式菜单 ; 下拉菜单 ; 下拉式功能表
horizontal dropdown menu 水平下拉菜单
Checkbox Dropdown Menu 可以核选的下拉式选单
Vertical Dropdown Menu 垂直下拉菜单
Enter the test script name, select Functional Tester from the Type dropdown menu.
输入测试脚本名，从type下拉菜单中选择Functional Tester。
The default search is most often a search engine like Google or Yahoo, and a dropdown menu displays the different customized searches.
默认的搜索通常是像Google或Yahoo这样的搜索引擎，下拉菜单显示不同的定制搜索入口。
After adding the new condition, you will see a conditional statement dropdown menu, which will have options such as "Less than," "Less than or equal to," "Greater than", and so forth.
加入新的条件后，你就会看到一个下拉菜单式的条件语句，包括诸如“小于(Less than)”、“小于等于(Less than or equal to)”、“大于(Greater than)”等选项。
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