indispensable element

基本解释

The technique and the concept are two indispensable elements of a good painting.
对于一幅好画来说，技术和观念这两个要素缺一不可。
Most of these features are designed for some "jazzy" functionality, but often at the expense of other indispensable elements.
那些特性中的大部分设计用于一些 “花哨” 的功能，但通常以其他不可缺少的元素为代价。
Good faith, profit, equal transaction, free competition, complying with game rules and legal system are all indispensable elements in market economy.
诚信与盈利、平等交易、自由竞争、遵守游戏规则和法制等，都是市场经济的不可或缺的构成要素。

Luther Perkins and his electric guitar playing are also indispensable elements of what makes this an amazing song.
NPR: Johnny Cash's 'Big River'