The thumbprint reference is much more compact than a full certificate, so using the reference reduces the message size and processing overhead.
thumbprint reference 要比完整的证书更加简洁，因此使用引用可以减小消息的大小和处理开销。
Because this example was so simple, you could write the same query here. Instead, you could write the same query in a more compact manner, much as you did previously.
因为这个例子很简单，在这里您可以这样编写这个查询。
Before we get down to business it's worth stopping for a moment to ask the question: why would anyone want a digital SLR when compact digital cameras are so much smaller, lighter and more affordable?
在我们开始之前，我们应该首先来问一个问题：既然小型数码相机小得多、轻得多、并且价格更容易让人接受，为什么还有那么多人想要单反呢？
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