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.
無論他如何去除那些雜草，它們還是會再長出來，對他來說那些雜草是永久的麻煩。

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

Ephemeral a. 短暫的；
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.
這位80歲的老人在回想他的一生時意識到人生的樂趣是短暫的；仿佛他昨天還是個年輕人。

Evanescent a. 易逝的，會凋零的；
She was determined to be a lasting success; unlike her sister she would not depend on evanescent fame and fortune.
她決心獲得持久的成功，而不是像她姐姐那樣依賴易逝的名聲和財富。

Consonance n. 一致，調和；
As the newlyweds walked along the beach, they experienced a feeling of deep consonance; it was as though their hearts beat as one.
這對新婚夫妻沿著沙灘散步時感受到深深的共鳴；好像他們兩個的心已經合二為一。

Felicitous a. 怡當的；得體的；
His behavior was felicitous; it was always perfect for the occasion.
他的舉止得體，任何場合總是表現得恰如其份。

Decorous a. 有禮貌的；鳙莊的；嚴謹的；
It was difficult for the ring bearer to remain decorous during the ceremony; it was not in his nature to remain still and quiet.
在婚禮中負責端戒指的那位人士，天生好動，想叫他正正經經、安靜不說話，根本是不可能的。

Grandiose a. 宏偉的，堂皇的；
The grandiose ballroom of the hotel, seemed ill-fitted for the small wedding reception.
這家飯店的宴會廳富麗堂皇，不太適合舉辦小型婚禮接待會。

Nonesuch n. 無以匹敵的人，典范；
He is the nonesuch of dry humor, no one tells jokes with quite his style and wit.
他說笑話時總是泰然自若地，那份風采和機智無 人能比。

Quintessence n. 精華；精髄；典范；
His poem summed up the quintessence of the American dream: a nice home, comfortable life-style and a happy family.
他的詩槪括美國夢之典范：一座美好的房子、舒適的生活方式和幸福的家庭。