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必需
bì xū
essential
水是人类生存的必需品。
Water is an essential substance for human survival.
formal
Absolutely necessary; indispensable.
维生素C是人体必需的营养素。
Vitamin C is a nutrient essential to the human body.
这份工作需要必需的技能。
This job requires essential skills.
Used to describe things that are fundamental or required for a particular purpose or existence.
Related Phrases
Pro Tip
Avoid confusion with '必须'
'必须' is a modal verb meaning 'must' or 'have to' (e.g., 你必须完成作业), while '必需' is an adjective meaning 'essential' (e.g., 必需的营养). They are not interchangeable.
Gold Rule
Position in sentences
'必需' typically precedes nouns it modifies (e.g., 必需的资源). It does not function as a standalone verb.
Word Origin
Combines '必' (must, necessarily) and '需' (to need). First attested in classical Chinese texts, reflecting the compound meaning of absolute necessity.
Usage Notes
Commonly used in formal contexts, such as regulations, scientific discussions, or technical descriptions. Often paired with '品' (item) or '条件' (condition) to form compound nouns.
Word Breakdown
必
must, necessarily
root需
to need, requirement
root汉英词典