原形：ascertain第三人称单数：ascertains过去式：ascertained过去分词：ascertained现在分词：ascertaining

It is difficult to ascertain what happened here.
这里发生的事情很难查明.
We must ascertain the usual customs of the local people.
我们必须了解当地人民的风俗习惯。
These certificates are used to ascertain the trustworthiness of the client system.
这些证书用于确定客户端系统是否可以信任。
The scientist ascertained the cause of the chemical reaction through careful experimentation.
科学家通过仔细的实验确定了化学反应的原因。
She ascertained her child's whereabouts immediately after receiving the worried call from the school.
她一接到学校的担忧电话就确定了孩子的位置。
The lawyer meticulously ascertained all the facts before presenting her case in court.
律师在庭上陈述案情前，详细核实了所有事实。
The police ascertained that the stolen painting had been recovered undamaged.
警方确认被盗的画作已完好无损地找回。
To ascertain the level of customer satisfaction, a survey was conducted.
为了确定顾客满意度，进行了一项调查。
The doctor's diagnosis was confirmed when they ascertained the patient's symptoms matched the disease.
医生确认患者的症状与疾病相符时，确诊了他的病症。
The archaeological team ascertained the age of the ancient artifacts using carbon dating techniques.
考古团队使用放射性碳测年法确定了古代文物的年代。
The company's financial status was ascertained by a thorough audit.
公司财务状况通过全面审计得到了确认。
In order to ascertain the truth, the investigator meticulously examined every piece of evidence.
为了查明真相，调查员仔细检查了每一项证据。
The climatologist ascertained a significant increase in global temperatures over the past decade.
气候学家证实过去十年全球气温有显著上升。