alpha and omega
[短语]
the most important parts or features of something
Ex: The first and last scenes of a movie often serve as alpha and omega, setting the tone and leaving a lasting impression on the audience .
bare bones
[名词]
the most important or basic facts about something

基本要点, 核心内容
Ex: The artist 's sketch captured the essence of the scene with bare bones lines , leaving out unnecessary details .艺术家的素描用**基本**的线条捕捉了场景的本质,省略了不必要的细节。
bare essentials
[名词]
things that are considered the most basic or necessary

基本必需品, 最必要的东西
Ex: The backpacker carried a small backpack with just the bare essentials for hiking and camping in the wilderness .背包客只带了**基本必需品**的小背包,用于在荒野中徒步和露营。
building blocks
[名词]
small parts that once joined can make a whole

积木, 基本要素
Ex: The scientific method and critical thinking are the building blocks of scientific inquiry , enabling researchers to investigate and understand the natural world .科学方法和批判性思维是科学探究的**基石**,使研究人员能够调查和理解自然界。
the nitty-gritty
[短语]
the most important aspects or principles of something such as an experience or idea
Ex: Before signing the contract , make sure you the nitty-gritty of the terms and conditions .
part and parcel
[短语]
a part of something that is considered its most integral or essential component
Ex: When traveling, delays and unexpected challenges are part and parcel of the adventure.
nuts and bolts
[短语]
the most basic or essential aspects of something
Ex: The book offers a comprehensive guide that covers nuts and bolts of starting and running a successful business .
grass roots
[名词]
a movement that originates from ordinary people or the general public, rather than from the leaders or officials of an organization or political party

基层, 草根运动
Ex: The organization plans to launch a grassroots campaign to address social inequality.该组织计划发起一场**基层**运动来解决社会不平等问题。
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