scratch about for的意思|示意

By using these tools, the they can build a Web application from scratch and control everything about the applications' behavior and appearance, with many options for customization.

通过这些工具，可以利用许多定制选项，从零开始构建Web应用程序，并且控制关于应用程序的行为和外观的每件事情。

I had a Windows partition that I have not booted into for about six months, so I decided to use that instead of installing from scratch.

我有一个Windows分区，已经有6个月左右的时间没有启动过了，我决定使用这个分区，而不是从头开始安装。