“…Select P antibodies from A(it) to constitute the memory units M(it) ={m 1 (it),m 2 (it),…,m P (it)}. Step 2 Carry out the clone operation to A(it)∪M(it), and get Z(it): Z(it)= T c (A(it)∪M(it)) ={ T c (a 1 (it)), T c (a 2 (it)),…, T c (a N (it)), T c (m 1 (it)), T c (m 2 (it)),…, T c (m P (it))} ={a 11 (it),…,a 1R (it),…,a N1 (it), …,a NR (it),m 11 (it),…, m 1R (it), …,m P1 (it), …,m PR (it)} ={z 1 (it),z 2 (it), …,z r (it)}, where r=(N+P)R.…”