今天我们要学的词是optimistic。 Optimistic乐观的。美国第二季度国内生产总值公布后，"President Barack Obama said he is 'guardedly optimistic' about the direction of the U.S. economy," 美国总统奥巴马表示，他对美国经济的发展方向持“谨慎乐观”态度。

乐观有助健康。最新研究发现，"Women 50 or older who are optimistic are less likely to get heart disease," 五十岁以上的妇女中，乐观的人更不容易得心脏病。"Optimistic women live longer and healthier lives than their pessimistic peers," 乐观比悲观的同龄女性寿命更长，身体更健康。好的，今天我们学习的词是optimistic...