【上位】 an inferior state resulting from the process of decaying; "the corpse was in an advanced state of decay"; "the house had fallen into a serious state of decay and disrepair" 腐食の進行に起因するあまり良くない状態。
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【下位】 a noticeable deterioration in performance or quality; "the team went into a slump"; "a gradual slack in output"; "a drop-off in attendance"; "a falloff in quality" 性能または品質の顕著な悪化。
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