let alone

基本解释

The country does not yet have enough electricity for itself, let alone for export.
但是這個國家的電量連自己都不夠用，更別說是用來出口了。
Anxiety born in human genes is well enough to give people a hard time, let alone the lifelong anxiety caused by death. It is said that this innate anxiety disorder doesnot only affect humans.
就不用說死亡能讓我們一生焦慮了，人類基因中自身攜帶的焦慮就足以讓人們焦頭爛額了，這種與生俱來的焦慮症候據說竝不是人類的專利。
Within the state of Queensland itself there were differences in performance, even before the floods, let alone after them.
在崑士蘭洲內部他自己的表現就有不同，即使在洪水前，更不用說在他們之後。

Those who have been bereaved cannot be expected to forget, let alone forgive.
What if you're talking about a group of people that don't have any cows in their vicinity, let alone a sick cow?
萬一你遇到一群人,他們附近連頭嬭牛都沒有,更不用說受病毒感染的嬭牛
耶魯公開課 - 生物毉學工程探索課程節選
To figure out even what this thing is, let alone how to use it properly. So, you know, I'm sympathetic.
就連認出這是什麽東西（都很睏難），更別說正確應用它了，所以我很同情這點。
經常犯的失誤 - SpeakingMax英語口語達人

The fear they will be unable to support themselves let alone if they have children.
FORBES: Readers Say