on sb's behalf 为某人的利益 ; 为了
write on sb's behalf 替他人写东西 ; 代笔的解释
to act on sb's behalf 代办
act on sb's behalf 代表某人行事
exercise influence on sb's behalf 为某人而尽力
Because do not have aptitude giving a bill, the business essence of travel website is "only buy on sb's behalf", after receiving good order, still need to go again railroad branch buys a ticket.
由于没有出票资质，旅游网站的业务实质只是“代购”，接好订单后，还需要再去铁路部门购票。
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