<div class="form-group"> ? ?<label for="email" class="col-sm-2 control-label">Email1</label> ? ?<div class="col-sm-6"> ? ? ?<input type="email" class="form-control" id="email" placeholder="email"> ? ?</div> </div> <div class="form-group"> <label for="email" class="col-sm-2 control-lable">email2</label> <div class="col-sm-6"> <input type="email" class="form-control" id="email" placeholder="email"> </div> </div><table>在學習bootstrap，發現用lable和用label是兩個不同效果，請問這兩個有什么區別嗎