notarize
verb [ T ] US (UK usually notarise) uk/ˈnəʊ.tər.aɪz/ us/ˈnoʊ.t̬ə.raɪz/
公证，为…作公证
If a letter or other document is notarized, it is signed by a notary public.
a notarized affidavit 经过公证的宣誓作证书
The airline requires children travelling alone to have a notarized letter of consent from one or both parents. 航空公司要求单独旅行的儿童必须出具来自父母一方或双方的同意书。