必要 [ㄅㄧˋ ㄧㄠˋ; bi4 yao4]
necessary
essential
indispensable
required
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必要
必用
ひつよう
adjectival nouns or quasi-adjectives (keiyodoshi)
[必用 can imply has to be used rather than is just needed]
necessary
needed
essential
indispensable
noun (common) (futsuumeishi)
necessity
need
requirement
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