optimistic名词
optimistic名词：optimism
n.乐观;乐观主义
optimistic
adj.乐观的;抱乐观看法的
派生词： optimistically (adv.)
例句：
A mood of optimism swept through the company and its customers.
公司上下及其顾客都洋溢着一股乐观情绪。
Optimism was gradually taking the place of pessimism
乐观情绪逐渐取代了悲观主义。
only time will tell whether Broughton\'s optimism is justified
只有时间会验证布劳顿的乐观是否合理。
