vital role
definitions
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An essential, indispensable, or extremely important function, part, or contribution to the success, existence, or functioning of something.ja: 極めて重要な役割
examples
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The rainforest plays a vital role in regulating the global climate by absorbing carbon dioxide.
熱帯雨林は二酸化炭素を吸収することで、地球の気候を調節する極めて重要な役割を果たしています。