01
leave alone
听…自便，随…去，不打扰
leave sth alone或leave sb alone.
Just leave me alone and stop asking me questions.
别烦我，别再问我问题了。
Does this mean that in time fish might learn to leave alone all food on hooks that they have seen before?
这是否意味着鱼迟早会学会不碰它们见到的鱼钩上的食物？
A shopping center is no place for a child to be left alone.
购物中心可不是让孩子单独呆着的地方。
02
let alone
（通常用在否定句后）遑论，更别提，更不用说
let alone用来把某事与不太可能的事情做对比，以进行强调。
这个短语通常被用作“具有否定结构的句子”。
It felt strange just to think that, let alone say it.
光想想就觉得很奇怪，更别提说它了。
None of us wanted to be around our father, let alone to live with him.
我们谁也不想走到父亲身旁，更别说和他住在一起了。
Many issues in headlines today won't much matter in a decade, let alone in a century.
现在新闻头条上的许多问题在十年后就不会有多大影响，更不用说一个世纪后了。
It is rare that police officers in the US are charged, let alone convicted, for use of lethal force.
在美国，很少有警察因为使用致命武力而被起诉，更不用说被定罪了
