正在学编程，大师傅们能给我指点一下么
O1234
G99
M03 S800 T0101
M08
G0 X70 Z2
G71 U2 R0.3
G71 P1 Q2 U0.5 W0.5 F0.22
N1 G0 X41
G1 Z0
X42 Z-0.5
Z-20
X50 Z-35
X61
X62 W-0.5
Z-49.5
X61 Z-50
N2 X70
G70 P1 Q2 S1200 F0.02
G0 X200 Z200
T0202 3毫米切刀
M03 S800
G0 X28.8 Z2
G74 R1
G74 X15.2 Z-7.8 P2500 Q2000 F0.12
G0 X30 Z2
G1 Z0 F0.02
G1 X29 Z-0.5
Z-8
X16
G0 Z2
X14
G1 Z0
X15 Z-0.5
Z-8
G0 Z200
X200
M30