乐观主义用英语怎么说？

乐观主义

例句

• Optimism made him alive through the hard days. 乐观主义使他在艰难的岁月里活了下来。
• The man who is a pessimist before forty - eight knows too much; the man who is an optimist after forty - eight knows too little. 未逾 四十八 岁的悲观主义者,是知道得太多之人; 而年逾 四十八 岁的乐观主义者,是知道得太少之人.
• Optimist: A man who gets treed by a lion But enjoys the scenery. 乐观主义者: 被狮子逼上了树但仍然能欣赏风景的人.
• We are optimist and realist. 我们是乐观主义者,又是现实主义者.
• Even if the optimists' theory is true, it still seems a thin argument against reform. 就算乐观主义者的理论是对的，还是不足以阻止改革的进行。