"CAPTURE your BIOMETRICS":
To proces your application, the U.S.Citizenship & Immigration Services (USCIS) must capture your biometrics.
When you go to the Application Support Center to have your Biometrics taken, you must bring:
1. This Appoinment Notice and
2. Photo Identification.... (a list of avualable ID).
我的問題是, 什麽是biometrics? 指紋,照片?好像這次見麵不是為了求證什麽。不知我的理解是否正確?