无论何时你想要创建对搜索引擎和对未安装插件的浏览者友好的网页时，替换内容都是你最好的朋友。
In all cases where you like to create search-engine-friendly content or content that is accessible to people who browse the web without plugins, alternative content is your best friend.
强化：自动展开并替换t witter链接中的原始网页标题(如果有的话)。
Enhancement: Links in tweets are automatically expanded and replaced with the target page title if available.
Mozilla实验室团队认识到，目前从网页上上传文件的功能最多只能算是可以使用，所以他们希望有更好的插件来替换。
The Labs team realized that uploading files from a web page is serviceable at best, so they want something better to replace it.
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