周四，美国总统乔·拜登在华盛顿特区郊外的沃尔特里德国家军事医疗中心接受了体检。白宫医生凯文·奥康纳（Kevin O'Connor）在总结中写道，拜登“仍然是一名健康、精力充沛的80岁男性”，适合履行职责。过去一年拜登最引人注目的健康事件是他在夏天感染了新冠肺炎，奥康纳说，并补充说，已经接种了二价疫苗的总统没有经历过任何抵抗

Happiness is like a pebble dropped into a pool to set in motion an ever-widening circle of ripples. As Stevenson has said, being happy is a duty. There is no exact definition of the word happiness. Happy people are happy for all sorts of r