【20分】assuage allay alleviate有什么区别?

【20分】assuage allay alleviate有什么区别?
如题
要适用的具体语境

assuage /əˈsweɪdʒ/ DJ 发音 /ə'swedʒ/ KK verb VN formal
to make an unpleasant feeling less severe 缓和,减轻（不快）
His reply did little to assuage my suspicions. 他的答覆一点也没有减少我的怀疑.
If you assuage an unpleasant feeling that someone has, you make them feel it less strongly.
If you assuage a need or desire for something, you satisfy it.
allay /əˈleɪ/ DJ 发音 /ə'le/ KK
to make sth, especially a feeling, less strong 减轻（尤指情绪） verb VN formal
to allay fears/concern/suspicion 减轻恐惧／忧虑；减少怀疑
If you allay someone's fears or doubts, you stop them feeling afraid or doubtful.
assure /əˈʃʊə(r)/ DJ 发音 /-ʃɔː(r)/ DJ 发音 /əˈʃʊr/ DJ US 发音 /ə'ʃur/ KK US verb
to tell sb that sth is definitely true or is definitely going to happen, especially when they have doubts about it 使确信；向…保证 ~ sb (of sth)
I know you think I did it deliberately, but I assure you (that) I did not. 我知道你认为我是故意干的,不过我向你保证不是故意的. VN (that)
We were assured that everything possible was being done. 我们确信是在尽一切努力.
She's perfectly safe,I can assure you. 我可以向你保证,她绝对安全. VN
We assured him of our loyal support. 我们使他确信我们始终不渝的支持.
He'll come back,’ Susan assured her. “他会回来的.”苏珊安慰她道. VN speech
to make yourself certain about sth 弄清；查明 ~ yourself (of sth)
He assured himself of her safety. 他确定她是安全的. VN
She assured herself that the letter was still in the drawer. 她查清楚信仍然在抽屉里. VN that
to make sth certain to happen 确保；使确定
Victory would assure a place in the finals. 胜利将确保能参加决赛. VN
Victory would assure them a place in the finals. 胜利将确保他们能参加决赛. VNN
to insure sth, especially against sb's death 保险（尤指人寿险） VN British English
What is the sum assured? 人寿保险额是多少?