The lecture was as dull as ditchwater.
那次讲座非常呆板乏味.
《现代汉英综合大词典》
I tried to read her latest book but found it as dull as ditchwater.
我试着读她最新的书,但发现那本书非常单调乏味.
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This novel is as dull as ditchwater, it doesn't have any decent plots.
这部小说的情节真干巴,没什么故事性.
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