9. A user authentication system for authenticating a user, the user authentication system comprising: a memory; a processor communicatively coupled to the memory; and a user authentication module coupled to the memory and the processor, wherein the user authentication module is configured to perform the steps of a method comprising: transmitting to the user a question prompt requiring the user to speak out a voice segment and an answer to a dynamic question, wherein the voice segment has a corresponding text dependent speaker verification model enrolled before an authentication, and wherein the question prompt requires the user to speak out the voice segment part and the answer to a dynamic question part in a preset order; segmenting, in response to receiving a voice answer, the voice segment part and the dynamic question answer part out from the voice answer; and verifying a boundary smoothness between the voice segment and the answer to the dynamic question within the voice answer.
9. A user authentication system for authenticating a user, the user authentication system comprising: a memory; a processor communicatively coupled to the memory; and a user authentication module coupled to the memory and the processor, wherein the user authentication module is configured to perform the steps of a method comprising: transmitting to the user a question prompt requiring the user to speak out a voice segment and an answer to a dynamic question, wherein the voice segment has a corresponding text dependent speaker verification model enrolled before an authentication, and wherein the question prompt requires the user to speak out the voice segment part and the answer to a dynamic question part in a preset order; segmenting, in response to receiving a voice answer, the voice segment part and the dynamic question answer part out from the voice answer; and verifying a boundary smoothness between the voice segment and the answer to the dynamic question within the voice answer. 11. The user authentication system according to claim 9 , wherein the voice segment part enrolled in advance and the answer to the dynamic question part have pronunciation consistency therebetween.