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標題: Americans Are Unhappier Than Ever.
Solo Dining May Be a Sign.
正文：The United States slipped to its lowest ranking ever in the World Happiness Report, in part because more Americans are eating alone. Once again, the Finns came out on top.
知識點 ：Solo n./adj./adv.
Having or doing something alone; a performance by one person. 單獨的（地）；單人的（地）；獨唱（曲），獨奏（曲）
The singer gave a solo performance on the stage. 這位歌手在舞臺上進行了獨唱表演。
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