当找到一个引导设备之后，第一阶段的引导加载程序就被装入RAM并执行。
When a boot device is found, the first-stage boot loader is loaded into RAM and executed.
接着，浏览器装入HTML文件，并执行脚本。
Next the browser loads the HTML file and executes the script.
JVM验证类装入器中所有的类并确保应用程序不会执行任何危险操作。
The JVM verifies all classes in class loaders and ensures that applications do not perform any dangerous operations.
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