He was always optimistic, even when things were at their worst.
他即使在情况最糟糕的.时候也总是很乐观。
We have every reason to feel optimistic.
我们完全有理由感到乐观。
They are cautiously optimistic that the reforms will take place.
他们对是否实行改革表示审慎的乐观。
She's not very optimistic about the outcome of the talks.
她对会谈的结果不太乐观。
When asked about the company's future, the director responded that he remained optimistic.
问到公司的未来的时候，经理回答说他依然乐观。