必需，意思是非有不可的；不能少的。容易与必须混淆。
必需 [bì xū]
n. need
adj. indispensable
adv. needs
misc. be indispensable to
网络释义专业释义
...《马关合同（convention）》)伤害（harm）了欧洲和德国的好处，虽然后者的规模（scope）尚小，我们不能不抗争。日本必需（must）妥协（make a concession），因为对三国奋斗（struggle）是没有希望的。
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睡觉作为生命(Life)所必需(Essentiing)的进程(Process)，五天不睡觉人也许就会死去，据思索(Seminar)，即日不得不补睡了一会。
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短语
必需氨基酸 [生化] Essential amino acid ; Eaa ; indispensable amino acid ; essentielle Aminoseuren
必需品 [经] necessity ; necessary ; necessities ; requisite
必需脂肪酸 [生化] essential fatty acid ; EFA ; indispensable fatty acid ; die essentielle Fettsaeure
基本生活必需品 daily necessities
必需营养素 Essential nutrient
必需的 required ; necessary ; indispensable ; Essential
非必需氨基酸 [生化] non-essential amino acid ; NEAA ; essential amino acid ; dispensable amino acid
生活必需品 the bare necessities of life
必需品专卖店 essentials store
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essential - 引用次数：202
Both signals are generally believed to be essential for B cell proliferation as well as for Ig secretion.
一般认为这两种信号是B细胞激活并产生免疫球蛋白(Immunoglobulin，Ig)所必需的。
参考来源 - T
·2,447,543篇论文数据，部分数据来源于NoteExpress
双语例句原声例句
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他们无法得到住房取暖必需的燃料。
They've been deprived of the fuel necessary to heat their homes.
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此行业的产品分配环节必需重组。
Reorganization is necessary on the distributive side of this industry.
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他有着跻身内阁所必需的冷酷品性。
He had the ruthless streak necessary to carry him into the cabinet.
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You've always got to be reinventing what you're doing based on the technology and what's going on.
必需得创新,根据技术和时下局势创新。
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but what works for me the best is to really step out of this sort of need to create
但是对我来说最有用的方法，就是要走出一种必需创造的意念
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The plants can be deficient in certain things, especially fat soluble vitamins that come from meat and from essential amino acids.
植物中缺乏某些物质,特别是脂溶性维生素,那些只能从肉类和必需氨基酸中获得
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