结婚两周年。
美国移民规定 8 CFR 235。11(b) 中说：
(b) Correction of endorsement on immigrant visa 。 If the alien is subject to the provisions of section 216 of the Act, but the classification endorsed on the immigrant visa does not so indicate, the endorsement shall be corrected and the alien shall be admitted as a lawful permanent resident on a conditional basis, if otherwise admissible。
   Conversely, if the alien is not subject to the provisions of section 216 of the Act, but the visa classification endorsed on the immigrant visa indicates that the alien is subject thereto (e。
  g。, if the second anniversary of the marriage upon which the immigrant visa is based occurred after the issuance of the visa and prior to the alien's application for admission) the endorsement on the visa shall be corrected and the alien shall be admitted as a lawful permanent resident without conditions, if otherwise admissible。
  
"the second anniversary of the marriage" 是结婚两周年的意思。