调查人员承认他们对这起凶杀案一无所知。
The investigators admit that they are completely in the dark about the killing.
警方花了一整年的时间调查这起凶杀案。
凶杀案发生后，警察被派去调查。
A murder was reported and the police were sent to investigate.
凶杀案一发生警方就开始调查此案。
The police began to look into the case of murder as soon as it happened.
凶杀案一发生警方就开始调查此案。
The police began to look into the case of murder as soon as it happened.
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