Grammar Note
作名词时通常可数，复数形式为 killers；可指‘杀人者/致死之物’，也可比喻‘极难对付或导致失败的事物’。
杀手；凶手；致命之物
先理解核心含义，再看它在真实句子里的用法。
杀手；凶手；致命之物
a person, animal, or thing that kills; a cause of death
The police finally caught the killer.
警方最终抓住了凶手。
杀手
One who or that which kills.
杀手
someone who causes the death of a person or animal
导致压力或极其困难的事物
That which causes stress or is extremely difficult, especially that which may cause failure at a task.
致死因素
the causal agent resulting in death
The killer escaped through the back window.
凶手从后窗逃走了。
AI contextual example
Killers often try to hide the evidence.
凶手往往试图掩盖证据。
AI contextual example
heart disease is the biggest killer in the United States
心脏病是美国最大的杀手。
WordNet
that exam was a real killer
那场考试真难对付。
WordNet
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作名词时通常可数，复数形式为 killers；可指‘杀人者/致死之物’，也可比喻‘极难对付或导致失败的事物’。
Collins 词频等级为 3，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 DICTIONARY_API_DEV, ECDICT, WIKTIONARY.