The subject of any other monograph must comply throughout its periodofuse.
任何各论的物质也必须服从其使用期限。
2
Most Internet products or services fall into the definition of an Experience Good: a product that needs a periodofuse before the customer can determine the value they can derive from it.
大多数互联网产品或服务都可以被定义为是“体验产品”：顾客需要使用一段时间才能看到它的价值。
3
Useof computers spread rapidly during that period.