He was always optimistic, even when things were at their worst.

　　他即使在情況最糟糕的時(shí)候也總是很樂(lè)觀。

　　We have every reason to feel optimistic.

　　我們完全有理由感到樂(lè)觀。

　　They are cautiously optimistic that the reforms will take place.

　　他們對(duì)是否實(shí)行改革表示審慎的樂(lè)觀。

　　She's not very optimistic about the outcome of the talks.

　　她對(duì)會(huì)談的結(jié)果不太樂(lè)觀。

　　When asked about the company's future, the director responded that he remained optimistic.

　　問(wèn)到公司的未來(lái)的時(shí)候，經(jīng)理回答說(shuō)他依然樂(lè)觀。