The lecture was as dull as ditchwater.
那次講座非常呆板乏味.
《現代漢英綜合大詞典》
I tried to read her latest book but found it as dull as ditchwater.
我試著讀她最新的書,但發現那本書非常單調乏味.
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This novel is as dull as ditchwater, it doesn't have any decent plots.
這部小說的情節真干巴,沒什么故事性.
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