副詞 let alone:

1. much less
   同義詞：not to mention

1. There isn't enough room for us, let alone six dogs and a cat.
   連我們的地方都不夠，更不必說六條狗和一支貓了。
2. I haven't decided on the menu yet, let alone bought the food.
   我還沒決定吃什么菜呢，更不必說買好了。
3. I never thought of it, let alone did I do it.
   我想都沒有想到它，更談不上去做了。
4. He hasn't enough money for food, let alone amusements.
   他連溫飽都無法解決，就更不用說娛樂了。
5. The baby can't even walk, let alone run.
   這小孩連走路都不會，更不用說跑了。