Time is an indispensable element in a sentence.

时间是语句构成中一个不可或缺的要素。

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Cognitive style is an indispensable element in learning modes.

认知风格是学习模式中不可缺少的要素。

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Character: in appreciating a short story, characters are an indispensable element.

人物：在短篇小说的欣赏中，人物是必不可少一个元素。

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W. Griffith's 1915 epic "Birth of a Nation, " but the film ultimately affirms Lincoln's recognition that compromise (including possible moral compromise) is an indispensable element of statecraft.

CNN: With Lincoln, a new frontier for Day-Lewis

Most importantly, it recognized as Congress has consistently done until this year the vital need for the MILSTAR program as an indispensable element of U.S. conventional and nuclear capabilities.

CENTERFORSECURITYPOLICY: Veto The Defense Bill

Institutional investors, both public and private, hampered by conflicts of interest and impediments imposed by corporate interests, have failed to exercise the oversight that is an indispensable element of the free market system.

CNN: Commentary: Wall Street finally got what it deserved