Making matters worse (for the pessimists, naturally) is research favoring optimists. Optimists biological stress systems arent perpetually running at full steam, taxing immune systems and inviting chronic disease.

• 更糟的是（自然是对悲观主义者而言）研究结果都支持乐观主义者。乐观主义者的生物应激系统不会一刻不歇地保持高度警惕状态，所以不会破坏免疫系统，让慢性病乘虚而入。