v. provide evidence for; stand as proof of; show by one's behavior, attitude, or external attributes
v. authenticate, affirm to be true, genuine, or correct, as in an official capacity
v. establish or verify the usage of
vi. 证明, 表明, 作证
vt. 为...作证
1. The witness will attest to what he saw during the accident.
证人将证实他在事故中看到的事情。
2. She needs someone to attest her identity before she can enter the building.
她需要有人证明她的身份才能进入大楼。
3. The doctor can attest that the treatment helped the patient recover.
医生可以证明这种治疗帮助患者康复。