黄页服务或者一个服务池(servicepool)。用来查询不断变化和日益复杂的的信息(比如开车从柏林到波尔图的路线，以及波尔图当前的温度)。
Yellow Pages or a service pool to query often-changing and more complex information (e.g. a route from Berlin to Porto by car, or the current temperature of Porto in Celsius).
黄页服务或者一个服务池(servicepool)。用来查询不断变化和日益复杂的的信息(比如开车从柏林到波尔图的路线，以及波尔图当前的温度)。
Yellow Pages or a service pool to query often-changing and more complex information (e.g. a route from Berlin to Porto by car, or the current temperature of Porto in Celsius).
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