失败的事；不奏效的事；哑弹；未爆炸的炸弹；不成功的人；未能爆炸的爆炸物；彻底失败或完全无效的事件
不成功的人
someone who is unsuccessful
未能爆炸的爆炸物
an explosion that fails to occur
彻底失败或完全无效的事件
an event that fails badly or is totally ineffectual
The fireworks display was a dud because of the rain.
由于下雨，烟花表演没有成功。
用法提示：名词，表示失败的事情。
We bought a batch of fireworks, but several were duds.
我们买了一批烟花，但有几个是哑弹。
用法提示：名词复数，表示没有爆炸的烟花。
His new business venture turned out to be a dud.
他的新创业项目结果是个失败。
用法提示：名词，表示无用的东西。
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