```html <ul class="nav nav-tabs"> <li class="active"><a href="#">蘋果</a></li> <li class="dropdown"> <a href="#" class="dropdown-toggle" data-toggle="dropdown">小米 <span class="caret"></span></a> <ul class="dropdown-menu" > <li><a href="#">小米手機</a></li> <li><a href="#">小米電腦</a></li> <li><a href="#">小米平板</a></li> </ul> </li> <li><a href="#">華為</a></li> </ul> ```