单词学习：contract killer 名词短语
contract killer
/ˈkɒntrækt ˌkɪlə(r)/
合同杀手；职业杀手；受雇杀手
The police suspected that the victim was targeted by a contract killer hired by a business rival, so they asked Mr. Gu, a criminology professor, for his expert analysis.
警方怀疑受害者是被商业对手雇用的合同杀手盯上的，因此他们向犯罪学教授顾老师征求专家分析。
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