Also, Windows 7 still requires add-on security software that has to be frequently updated.

此外，Windows7还需要安全软件插件，必须频繁更新。

youdao

You could begin with a lighting starter kit and add on security devices later.

你应该先从照明工具包入手，然后再安装安全设备。

youdao

You could begin with a lighting starter kit and add on security devices later.

你应该先从照明工具包入手，然后再安装安全设备。

youdao