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They are content and as happy as the day is long.
他们很满意,也非常快乐.
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There was I standing on a chair, singing away, merry as the day is long.
我就在那里站在一把椅子上, 唱着歌, 非常快活.
He is happy as the day is long.
他整天兴高采烈.
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