屏幕左侧边缘成了后退按钮，一般用于返回上一个应用程序。
The left edge of the screen is used as a back button, it is usually used to return to the previous application.
在一般的Web应用程序中，用户填写表单字段并单击Submit按钮。
In a normal Web application, users fill out form fields and click a Submit button.
记住Cookie一般随着每次请求被发送出去，甚至像请求按钮的Gif图片这样简单的事情。
Remember that cookies are normally sent with every request, even for things as simple as a request for a GIF file for a button on the page.
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