There must be sufficient background knowledge on the part of the reader to facilitate understanding of the concept expressed.
就读者而言，需要充足的知识背景去有助于表达这个概念的意思。
The background gray is a few shades lighter than on any other reader, producing much better contrast behind the black text.
背景灰度相比其他阅读器浅了几个层次，让黑色文本在背景上有着更高的对比度。
Now, having covered plenty of background, you're ready to start building your blog reader!
现在，介绍了足够的背景知识后，就可以开始构建博客阅读器了！
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