(@buy @sell )
%100
+0
+42
[@main]
ӭҪʲô\
 </@buy> ҩƷ\
 </@sell> ҩƷ\
 < /@exit> \
[@buy]
ʲôҩƷ\ \ \
 < /@main>\
[@sell]
ҿĶ\ \ \
 < /@main>\
[goods]
ǿЧҩ            100       3
ǿЧħҩ            100       3
ҩ()          100       3
ħҩ()          100       3
ҩ            100       3
ħҩ            100       3
̫ˮ   	      100	3
ǿЧ̫ˮ   	      100	3