Ascertain The Cause(推本溯源), 此释义来源于网络辞典。
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The detectives are trying to ascertain the cause.
侦探正设法查清原因。
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An autopsy was needed to ascertain the cause of his death.
需验尸方能确定他的死因。
Are many factors that can cause insomnia, so treatment of insomnia to ascertain the cause of symptomatic treatment.
很多种因素可以引起失眠，所以治疗失眠要查明原因，对症治疗。
Post-mortem tests were unable to ascertain the cause of his death but it is not being treated as suspicious.
BBC: River Thames body mystery police issue clothing clue
Post-mortem tests were unable to ascertain the cause of his death, but at the moment police are not treating it as suspicious.
BBC: Identity of body found in Thames at Wraysbury a mystery
Dr Holgate said he could not ascertain the cause of death.
BBC: Open verdict into Cornish bride's death in India
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