安装基础软件已经很困难了，更不用说配置高级安全协议了。

Setting up the basic software was challenging, ___to ___say ___nothing ___of configuring the advanced security protocols.

对他们来说，支付房租已经很困难了，更不用说攒钱去度假了。

Keeping up with the rent is difficult for them, ___to ___say ___nothing ___of saving for a vacation.

这座博物馆的常设展品已经令人印象深刻，更不用说它目前的特展了。

The museum's permanent collection is impressive, ___to ___say ___nothing ___of its current special exhibition.