v.（指潮水）退( ebb的过去式和过去分词 )；落；减少；衰落 双语释义：v.(动词)vi. (指潮水)退；落 (of the tide) flow back from the land to the seavi. 减少；衰落 grow less;become slowly,weak or faintn.(名词)[U]退潮；落潮 the flowing out of the tide[U]衰退；衰落 low state;decline or decay英英释义： ebb[ eb ]n.a gradual