Sign in advertising: Direct and customised advertising messages at time of signing in to the GDS by the travel agent.
注册广告(Signin Advertising)：旅游代理商注册登录GDS时定制式的直接广告信息。
Sign in advertising: Direct and customised advertising messages at time of signing in to the GDS by the travel agent.
注册广告(Signin Advertising)：旅游代理商注册登录GDS时定制式的直接广告信息。
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