英语每日一句：他时而快乐，时而绝望。
作者：沪江英语
2017-02-25 16:12
His mood alternates between joy and despair.
他时而快乐，时而绝望。
语言点：sb./sth. alternates between two things，意思就是they keep changing between them，在两者间交替
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