(@buy @sell @repair @s_repair )
%100
+20
+19
+21
[@main]
ӭ. ҿ԰ʲô?\ \
 </@buy>  \
 </@sell> 
 </@repair> \
 </@s_repair>\
 < /@exit>\
[@buy]
Ҫ?\ \ \
 < /@Main>
[@sell]
?\ \ \
 </@main>
[@repair]
Ҫ?\ \ \
 < /@Main>
[~@repair]
ȥѾ޺.\ \
 < /@Main>
[goods]

