His new-found optimism dissolved.(他剛剛建立的樂觀情緒消失了。)

General optimism and pessimism count.(總體上的樂觀和悲觀都很重要。)

While excessive optimism can promote bad investment patterns, resulting in a real-estate "bubble," the report's writers downplay that potential outcome in that it has not yet occurred.(雖然過度樂觀可能會助長不良投資模式，導致房地產“泡沫”的出現，但這篇報告的作者對這種潛在后果只是一筆帶過，認為它尚未發生。)

This is the most solid ground for optimism.(這是樂觀主義最有力的根據。)

When organisations are expanding and adding personnel, promotional opportunities, pay rises, and the excitement of being associated with a dynamic organisation create feelings of optimism.(當組織在擴張和增加人員時，晉升機會、加薪，以及與一個充滿活力的組織聯系在一起的興奮感，會讓人產生樂觀的情緒。)

Suzanne Segerstrom, professor of psychology at the University of Kentucky, believes that the key to increasing optimism is through cultivating optimistic behaviour, rather than positive thinking.(肯塔基大學心理學教授蘇珊娜·塞格斯特羅姆認為，增加樂觀情緒的關鍵在于培養樂觀行為而不是積極思維。)

The bypass held a new era in motor travel and was greeted with excitement and optimism.(這條路開啟了汽車旅行的新時代，迎接它的是人們的興奮和樂觀。)

Optimism and pessimism are both powerful forces, and each of us must choose which we want to shape our outlook and our expectations.(樂觀和悲觀都是強大的力量，我們每個人都必須選擇兩者之一，來塑造我們的前景和預期。)

History and news become confused, and one's impressions tend to be a mixture of skepticism and optimism.(歷史和新聞混雜在一起，給人的印象往往是懷疑和樂觀的混合體。)

There are very real grounds for optimism.(的確有理由可以樂觀。)

用作名詞(n.)

Optimism made him alive through the hard days.
樂觀主義使他在艱難的歲月里活了下來。Both parties expressed optimism about an eventual solution.
雙方對問題的最終解決都表示樂觀。

用作名詞 (n.)

動詞+～

cultivate optimism培養樂觀精神display optimism表現出樂觀態度

形容詞+～

blind optimism盲目樂觀extravagant optimism過分樂觀great optimism十分樂觀unfailing optimism始終如一的樂觀主義

介詞+～

do sth with optimism樂觀地做某事

～+介詞

optimism about the future樂觀地展望未來

I am astounded at the wave of optimism..There is a veritable tide of feeling that all is well.