【上位】 a condition requiring relief; "she satisfied his need for affection"; "God has no need of men to accomplish His work"; "there is a demand for jobs" 救援を必要とする状態。
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【下位】 the state of being absolutely required 絶対的に必要とされている状態。
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anything indispensable; "food and shelter are necessities of life"; "the essentials of the good life"; "allow farmers to buy their requirements under favorable conditions"; "a place where the requisites of water fuel and fodder can be obtained" 不可欠な何でも。
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