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来源：雅诚德英语网
The human body is influenced by natural chemicals that produce "a sense of happiness", noted BBC News.
BBC 新闻指出，人体会受到能产生“幸福感”的天然化学物质的影响。
The human body is influenced by natural chemicals that produce "a sense of happiness", noted BBC News.
BBC 新闻指出，人体会受到能产生“幸福感”的天然化学物质的影响。