A: You will begin to see more touch-screen laptops after Oct. 22, when Windows 7 comes out, because that new operating system has optional fingertip touch-screen navigation built in.

答：10月22日Windows 7面市后你将开始看到更多触屏笔记本电脑，因为新的操作系统具有内置的手指触屏导航选项。

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He said use of the operating system would be optional for all agencies.

他指出所有机构，使用那一操作系统都将成为一种选择。

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In addition, the operating system USES the ServicePackFilesi386 folder to store those files that are needed to install optional Windows components that aren't installed by default.

另外，操作系统使用ServicePackFilesi 386文件夹来存放非默认安装的、可选择的Windows组件的文件。

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