Twitter bootstrap 3 Boostrap 3-缩略图图像对齐问题

如何将它们以相同高度对齐成一行

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这里有几个问题：

你有一个我们看不到的wwd类。这是在运用某种风格吗

每个图像都有一个空白style=”“类。为什么会这样

如果删除指向引导样式的链接，则在应用的样式中看不到任何差异

图像的图像大小会影响布局，并且图像没有实际链接，因此很难复制。在示例中包含完整的链接，以使其更易于复制。 我用了一张假照片，但我看不出你看到的问题

         <div class="col-md-2">
   <div class="thumbnail">
     <a href="hyderabad/flats">
         <img src="https://external-content.duckduckgo.com/iu/?u=https%3A%2F%2Ftse1.mm.bing.net%2Fth%3Fid%3DOIP.r9MVqtg3zlXjdKLjkrZ04QHaE8%26pid%3DApi&f=1" alt="DEVELOPMENT SITES" style="" width="100px">
       <div class="caption" style="text-align:center;">
         <p>FLATS</p>
       </div>
     </a>
   </div>
 </div>

?

<div class = "row">
   <div class = "col-sm-6 col-md-3">
      <a href = "#" class = "thumbnail">
         <img src="https://external-content.duckduckgo.com/iu/?u=https%3A%2F%2Ftse1.mm.bing.net%2Fth%3Fid%3DOIP.r9MVqtg3zlXjdKLjkrZ04QHaE8%26pid%3DApi&f=1" alt = "Generic placeholder thumbnail" width="100px">
      </a>
   </div>
   
   <div class = "col-sm-6 col-md-3">
      <a href = "#" class = "thumbnail">
        <img src="https://external-content.duckduckgo.com/iu/?u=https%3A%2F%2Ftse1.mm.bing.net%2Fth%3Fid%3DOIP.r9MVqtg3zlXjdKLjkrZ04QHaE8%26pid%3DApi&f=1" alt = "Generic placeholder thumbnail" width="100px">
      </a>
   </div>
   
   <div class = "col-sm-6 col-md-3">
      <a href = "#" class = "thumbnail">
        <img src="https://external-content.duckduckgo.com/iu/?u=https%3A%2F%2Ftse1.mm.bing.net%2Fth%3Fid%3DOIP.r9MVqtg3zlXjdKLjkrZ04QHaE8%26pid%3DApi&f=1" alt = "Generic placeholder thumbnail" width="100px">
      </a>
   </div>
   
   <div class = "col-sm-6 col-md-3">
      <a href = "#" class = "thumbnail">
        <img src="https://external-content.duckduckgo.com/iu/?u=https%3A%2F%2Ftse1.mm.bing.net%2Fth%3Fid%3DOIP.r9MVqtg3zlXjdKLjkrZ04QHaE8%26pid%3DApi&f=1" alt = "Generic placeholder thumbnail" width="100px">
      </a>
   </div>
</div>