nitty-gritty 核心,本质nitty-gritty [] (来源：英语学习门户 http://www.
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【俚】(问题的)核心;基本的事实;本质
I like doing business with people who get right to the nitty-gritty.

我喜欢跟那种直截了当,一针见血的人做生意。

Noun
nitty-gritty (uncountable) (colloquial) The essence or core of something; the details.

He gave a short summary without getting into the nitty-gritty of the problem.