[intransitive] to become weaker, smaller or less good衰退；减少；下降◆The number of tourists to the resort declined by 10% last year.去年这个度假胜地的游客人数减少了 10%。◆The group has been hit by declining sales.这个集团遭受了销售量下降的打击。  ➡  see note at increase ⨁to decline dramatically / sharply / steeply急剧下降 ⨁ to decline gradually / slowly / steadily逐渐地／缓慢地／稳步地下降