两次烹饪法显得冗余，并且使你的网页不标准，还没有提供一种显示替换内容的机制。
The twice-cooked method is redundant, makes your web pages invalid, and doesn't include a mechanism for inserting alternative content.
轻松地提供能在多种浏览器，包括旧浏览器上显示的标准表示法。
Easily guaranteeing a standard presentation across various browsers, including older browsers.
本文采用国家标准方法——酚试剂分光光度法对成都50多处房屋室内的甲醛浓度及其变化规律作了具体的分析，结果显示，总样品甲醛平均浓度为0。
Using the national standard method-folin spectrophotometry, this paper makes detailed analysis of the concentration and the changing law of formaldehyde existing in the 50 more houses in Chengdu.
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