它是爬行器最早遇到的单词，也是页面在SERP中列出时显示的标题。
It's the first word or words the spider encounters and it's the title of your page's listing in the SERPs.
它不仅是一本书，还是书的祖先：最早的努力，试图取代羊皮卷，而用两边都可写的页面。
Not quite a book, but an ancestor—an early effort that replaced rolled parchment and allowed text to be inscribed on two
最早的版本（YAFFS）支持 512 字节页面的 flash 设备，但是较新的版本（YAFFS2）支持页面更大的新设备以及更大的 Write 限制。
The initial version (YAFFS) supported flash devices with 512-byte pages, but the newer version (YAFFS2) supports newer devices with larger page sizes and greater Write constraints.
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