请教会MATLAB的大侠

A=[1 6 9 10;3 12 6 8;4 7 9 11;5 12 13 14];
B=[4 6;2 4;2 2;1 0];
C=[0 0 2 1;8 0 2 2];
D=zeros(2,2);
G=ss(A,B,C,D)%系统状态方程模型
G1=tf(G)% 传递函数模型
G2=zpk(G1)%零极点模型
a =
x1 x2 x3 x4
x1 1 6 9 10
x2 3 12 6 8
x3 4 7 9 11
x4 5 12 13 14

b =
u1 u2
x1 4 6
x2 2 4
x3 2 2
x4 1 0

c =
x1 x2 x3 x4
y1 0 0 2 1
y2 8 0 2 2

d =
u1 u2
y1 0 0
y2 0 0

Continuous-time model.

Transfer function from input 1 to output...
5 s^3 + 22 s^2 - 131 s + 239
#1: -----------------------------------
s^4 - 36 s^3 + 52 s^2 + 467 s + 350

38 s^3 - 730 s^2 + 2732 s + 2982
#2: -----------------------------------
s^4 - 36 s^3 + 52 s^2 + 467 s + 350

Transfer function from input 2 to output...
4 s^3 + 100 s^2 - 10 s + 614
#1: -----------------------------------
s^4 - 36 s^3 + 52 s^2 + 467 s + 350

52 s^3 - 1140 s^2 + 5948 s + 6132
#2: -----------------------------------
s^4 - 36 s^3 + 52 s^2 + 467 s + 350

a =
x1 x2 x3 x4
x1 1 6 9 10
x2 3 12 6 8
x3 4 7 9 11
x4 5 12 13 14

b =
u1 u2
x1 4 6
x2 2 4
x3 2 2
x4 1 0

c =
x1 x2 x3 x4
y1 0 0 2 1
y2 8 0 2 2

d =
u1 u2
y1 0 0
y2 0 0

Continuous-time model.

Transfer function from input 1 to output...
5 s^3 + 22 s^2 - 131 s + 239
#1: -----------------------------------
s^4 - 36 s^3 + 52 s^2 + 467 s + 350

38 s^3 - 730 s^2 + 2732 s + 2982
#2: -----------------------------------
s^4 - 36 s^3 + 52 s^2 + 467 s + 350

Transfer function from input 2 to output...
4 s^3 + 100 s^2 - 10 s + 614
#1: -----------------------------------
s^4 - 36 s^3 + 52 s^2 + 467 s + 350

52 s^3 - 1140 s^2 + 5948 s + 6132
#2: -----------------------------------
s^4 - 36 s^3 + 52 s^2 + 467 s + 350

Zero/pole/gain from input 1 to output...
5 (s+8.268) (s^2 - 3.868s + 5.781)
#1: ----------------------------------------
(s-34.06) (s-5.088) (s+2.255) (s+0.8955)

38 (s-13.42) (s-6.672) (s+0.8767)
#2: ----------------------------------------
(s-34.06) (s-5.088) (s+2.255) (s+0.8955)

Zero/pole/gain from input 2 to output...
4 (s+25.34) (s^2 - 0.3378s + 6.058)
#1: ----------------------------------------
(s-34.06) (s-5.088) (s+2.255) (s+0.8955)

52 (s+0.8775) (s^2 - 22.8s + 134.4)
#2: ----------------------------------------
(s-34.06) (s-5.088) (s+2.255) (s+0.8955)

写出两输入两输出系统表达式？
没有看懂