ascertain

 Longman Dictionary of Contemporary English 5++朗文当代英语 5++LDOCE 5++朗文 5++as·cer·tain /ˌæsəˈteɪn $ ˌæsər-/ ●○○ verb [intransitive, transitive]  formalFIND OUT to find out something 弄清，确定，查明 SYN establish A postmortem was ordered to try to ascertain the cause of death. 下令验尸以查明死因。ascertain whether/what/how etc Tests were conducted to ascertain whether pollution levels have dropped. 进行了检测以确定污染程度是否已经下降。ascertain that Police had ascertained that the dead man knew his killer. 警方确定死者认识凶手。ascertain something from somebody/something You should ascertain the level of insurance cover from the car rental company. 你应该向汽车租赁公司打听清楚保险的范围。 —ascertainable adjective RegisterAscertain is used mainly in formal or technical contexts. In everyday English, people usually say find out: ascertain主要用于正式或科技语境中。 在日常英语中，人们一般说find outWe need to find out exactly what happened before we jump to any conclusions. 我们要弄清到底发生了什么事，不要贸然下结论。→ See Verb table

Examples from the Corpus

ascertain• Unfortunately, since there are so many possible explanations, the correct one is most difficult to ascertain.• As far as we have been able to ascertain, our client is not involved in anything illegal.• The pathologist ascertained that the victim had died from a gunshot wound.• He had previously ascertained that there were at least two aircraft with similar radio fits and noted their positions.• The reason was that it was not at that time ascertained that those materials were definitely to be used.• Read labels to ascertain the amount of fats in processed foods.• Try to ascertain the financing techniques used by your own country in its international transactions with the rest of the world.• It is not always easy to ascertain the source of a particular item of income.• Have you ascertained the strength and consistency of each symptom?• The case remains a mystery. The police were never able to ascertain the true facts.• With Bulstrode resigned from the hospital board, Dorothea summons Lydgate for advice and also to ascertain the truth.• Because of the nature of the sample this study could not ascertain the views of residents themselves.• A doctor should examine the patient to ascertain where the pain is localized.ascertain that• He has given you a cost breakdown as follows: You have also ascertained that: 1.• We can ascertain that deer has been eaten by man since prehistory.• If the complex number c is in the white region, then there is an algorithm for ascertaining that fact.• In consideration of any theft claim, it must be ascertained that the clauses have been complied with in every respect.• Accordingly, evaluation will be undertaken to ascertain that the preventive measures implemented have been effective.• But no; they ascertained that the smell was coming from their clothes.• He had previously ascertained that there were at least two aircraft with similar radio fits and noted their positions.• The reason was that it was not at that time ascertained that those materials were definitely to be used.Origin ascertain (1500-1600) Old French acertainer, from certain

as·cer·tain verb →REGISTER1ChineseSyllable  

Corpus find out to something

ascertain
as‧cer‧tain /ˌæsəˈteɪn $ ˌæsər-/ verb [intransitive and transitive]formal to find out something
   SYN  establish:
    A postmortem was ordered to try to ascertain the cause of death.
    ascertain whether/what/how etc
    Tests were conducted to ascertain whether pollution levels have dropped.
    ascertain that
    Police had ascertained that the dead man knew his killer.
    ascertain something from somebody/something
    You should ascertain the level of insurance cover from the car rental company.
—ascertainable adjective
     
REGISTER
  Ascertain.is used mainly in formal or technical contexts. In everyday English, people usually say find out:
  ▪ We need to find out exactly what happened before we jump to any conclusions.

as·cer·tainBrE /ˌæsəˈteɪn/ 🔊NAmE /ˌæsərˈteɪn/ 🔊 verbpresent simple - I / you / we / they ascertain BrE /ˌæsəˈteɪn/ 🔊 NAmE /ˌæsərˈteɪn/ 🔊present simple - he / she / it ascertains BrE /ˌæsəˈteɪnz/ 🔊 NAmE /ˌæsərˈteɪnz/ 🔊past simple ascertained BrE /ˌæsəˈteɪnd/ 🔊 NAmE /ˌæsərˈteɪnd/ 🔊past participle ascertained BrE /ˌæsəˈteɪnd/ 🔊 NAmE /ˌæsərˈteɪnd/ 🔊 -ing form ascertaining BrE /ˌæsəˈteɪnɪŋ/ 🔊 NAmE /ˌæsərˈteɪnɪŋ/ 🔊 (formal) to find out the true or correct information about sth 查明；弄清◆~ sth It can be difficult to ascertain the facts. 可能难以查明事实真相。🔊🔊◆~ that… I ascertained that the driver was not badly hurt. 我已查清，驾驶员伤势不重。🔊🔊◆it is ascertained that… It should be ascertained that the plans comply with the law. 须要弄清楚，这些计划要合法。🔊🔊◆~ what, whether, etc.… The police are trying to ascertain what really happened. 警方正设法查清到底发生了什么事。🔊🔊◆Could you ascertain whether she will be coming to the meeting? 请你弄清楚她来不来开会好吗？🔊🔊◆it is ascertained what, whether, etc.… It must be ascertained if the land is still owned by the government. 必须确定这块土地是否仍属于政府所有。🔊🔊▸ as·cer·tain·able BrE /ˌæsəˈteɪnəbl/ 🔊NAmE /ˌæsərˈteɪnəbl/ 🔊 adjective▸ as·cer·tain·ment BrE /ˌæsəˈteɪnmənt/ 🔊NAmE /ˌæsərˈteɪnmənt/ 🔊 noun [uncountable]