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1·There are rumours that their marriage is a sexless sham.

传言说他们根本没有性生活，婚姻只是徒具虚名。《柯林斯英汉双解大词典》

2·Where mutual love was lacking, marriage was a sham and had to be dissolved.

如果是缺乏互爱，婚姻是一个骗局，不得不解散。