From the standpoint of the browser, the page generation process is just a black box.

从浏览器的立场上看，页面生成过程完全是个黑盒子。

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The browser never displays more than one text box at a time.

浏览器一次只显示一个文本框。

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The browser never displays more than one text box at a time.

浏览器一次只显示一个文本框。

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