询问不必要的信息会惹人反感，阻碍他们注册收取邮件。
Asking for unnecessary information annoys people and may discourage them from signing up.
但阿里巴巴并不是扮演经纪行的角色，该网站向供应商收取发布产品信息和额外推广的费用，让他们在网站之外达成交易。
Rather than brokering transactions, Alibaba charges suppliers for listing items and for extra promotion, leaving them to seal the transaction off the site.
客户端可以通过交换器的名字来发送消息，也可以通过队列的名字收取信息。
Knowing the name of an exchange grants a client the power to publish messages to it, knowing the name of a queue the capability to receive messages from it.
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