killer

n. 瞄准器(扼杀剂,消光杂质,屠刀,杀人者)

The police chief spoke of his determination to catch the killer.

警长谈到他决意要抓获凶手。

The net result of the long police investigation is that the identity of the killer is still a complete mystery.

警方经长时间调查, 结果凶手的身分仍全然不知.