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1·The lecture was as dull as ditchwater.

那次讲座非常呆板乏味。《新英汉大辞典》

2·No changes would be made and you would have nothing to fight against. Life would be as dull as ditchwater.

没有变化，你就没有为之抗争的东 西，生活将极其乏味，就像地沟里的水一样。