Perpetual a. 永久的；
No matter what he did to destroy the weeds, they would return; they were a perpetual source of trouble to him.
无论他如何去除那些杂草，它们还是会再长出来，对他来说那些杂草是永久的麻烦。

Sempiternal a. 永久的，永恒的；
The disagreement between the children; was a continuation of the sempiternal feud between the families.
孩子之间的分歧就是家庭之间永恒世仇的延续。

Ephemeral a. 短暂的；
As the eighty-year-old man reflected on his life, he realized that for him the joys of life were ephemeral; it seemed as though yesterday he was just a young man.
这位80岁的老人在回想他的一生时意识到人生的乐趣是短暂的；仿佛他昨天还是个年轻人。

Evanescent a. 易逝的，会凋零的；
She was determined to be a lasting success; unlike her sister she would not depend on evanescent fame and fortune.
她决心获得持久的成功，而不是像她姐姐那样依赖易逝的名声和财富。

Consonance n. 一致，调和；
As the newlyweds walked along the beach, they experienced a feeling of deep consonance; it was as though their hearts beat as one.
这对新婚夫妻沿着沙滩散步时感受到深深的共鸣；好像他们两个的心已经合二为一。

Felicitous a. 怡当的；得体的；
His behavior was felicitous; it was always perfect for the occasion.
他的举止得体，任何场合总是表现得恰如其份。

Decorous a. 有礼貌的；鳙庄的；严谨的；
It was difficult for the ring bearer to remain decorous during the ceremony; it was not in his nature to remain still and quiet.
在婚礼中负责端戒指的那位人士，天生好动，想叫他正正经经、安静不说话，根本是不可能的。

Grandiose a. 宏伟的，堂皇的；
The grandiose ballroom of the hotel, seemed ill-fitted for the small wedding reception.
这家饭店的宴会厅富丽堂皇，不太适合举办小型婚礼接待会。

Nonesuch n. 无以匹敌的人，典范；
He is the nonesuch of dry humor, no one tells jokes with quite his style and wit.
他说笑话时总是泰然自若地，那份风采和机智无 人能比。

Quintessence n. 精华；精髄；典范；
His poem summed up the quintessence of the American dream: a nice home, comfortable life-style and a happy family.
他的诗槪括美国梦之典范：一座美好的房子、舒适的生活方式和幸福的家庭。