bare bones
[名词]
the most important or basic facts about something

基本事实, 核心要素
Ex: The artist 's sketch captured the essence of the scene bare bones lines , leaving out unnecessary details .
bare essentials
[名词]
things that are considered the most basic or necessary

基本必需品, 最基本的东西
Ex: The backpacker carried a small backpack with just bare essentials for hiking and camping in the wilderness .
building blocks
[名词]
small parts that once joined can make a whole

构建模块, 基础组成部分
Ex: The scientific method and critical thinking are building blocks of scientific inquiry , enabling researchers to investigate and understand the natural world .
the nitty-gritty
[短语]
the most important aspects or principles of something such as an experience or idea
Ex:
part and parcel
[短语]
a part of something that is considered its most integral or essential component
Ex:

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