Grammar Note
注意名词有复数形式duds。
失败者；无用的人
先理解核心含义，再看它在真实句子里的用法。
失败者；无用的人
someone who is unsuccessful
The fireworks display was a dud because of the rain.
由于下雨，烟花表演没有成功。
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
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。
His new business venture turned out to be a dud.
他的新创业项目结果是个失败。
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注意名词有复数形式duds。
Collins 词频等级为 1，建议结合例句记忆，而不是只背中文释义。
页面下方列出了常见词形变化。学习时注意它们在句子中的语法位置。
Dictionary facts from ECDICT, WIKTIONARY, WORDNET.