I can't imagine going out with someone who's always uptight and proper, let alone live with them for the rest of my life!

我无法想象与一个总是中规中矩的人恋爱约会，更别提跟他们过一辈子了。

youdao

There is not enough money to build adequate houses for the people that live there, let alone the new arrivals.

现在没有足够的资金为已经住在那里的人建房子，更不用说新来的居民了。

youdao

According to the regulation, parents or other guardians cannot let minors spend the night outside or let them live alone without wardship.

条例规定，父母或者其他监护人不得放任未成年人夜不归宿，不得让其脱离监护单独居住。

youdao

Colville calls this is an almost unimaginable situation for children and other civilians to have to live through for even one day, let alone months on end.

VOA: standard.2009.10.25

It clearly was not easy to live, let alone write.

WSJ: Wall Street Journal: Twelve Months of Reading

Her platonic best friend and neighbor, Jason (Adam Scott), thinks along similar lines, and so, taking the wacky initiative, they decide to have a child but never actually live together, let alone marry.

NEWYORKER: Friends with Kids