attest/attest to：作证,证明； 证实；是…的证据

abc

attest
at·test / əˈtest /

verb (formal)
1. ~ (to sth) to show or prove that sth is true
   证实；是…的证据
SYN   bear witness to :
  ▪ [V]
   Contemporary accounts attest to his courage and determination.
   当时的报道证实了他的勇气和决心。
  ▪ [also V that , VN]
2. to state that you believe that sth is true or genuine, for example in court
   作证,证明(如在法庭上):
  ▪ [VN]
   to attest a will
   就遗嘱作见证
   The signature was attested by ten witnesses.
   这个签名有两名见证人。
  ▪ [also V that]

at·test
/əˈtɛst/ verb , -tests, -test·ed, -test·ing
   formal   : to show, prove, or state that something is true or real
   [  no obj  ]
    — usually + to
    I can attest to the truth of his statement.
    The popularity of the treatment attests to its effectiveness. [=shows that it is effective]
   
   [  + obj  ] I can attest that what he has said is true.
    The certificate attests the authenticity of the painting.
    He was asked to attest [=authenticate] the will/signature.
    — often used as (be) attested
    The plant's presence in the ancient world is attested by fossils that have been found.
    the first attested written language
   
  at·tes·ta·tion /ˌæˌtɛsˈteıʃən/ noun , pl   -tions [  count  ]
   the first attestations of written language
  [  noncount  ]
   The signature required attestation.


at∙test / əˈtɛst ; əˈtest /
◙verb [formal]
1. [I,T] to show or prove that something is true
• 证明，作为（…的）证据:
▪ [+ to ]
»Luxurious furnishings attested to the wealth of the owner.
  豪华的家具陈设说明了主人的财力。
2. [T] to officially state that you believe something is true, especially in a court of law
• 〔尤指在法庭上〕证实