主规格：每个目录有一个主规格，它代表这个目录中所有产品共有的属性。
Primary specification: Each catalog has a primary specification representing the set of Shared attributes for all products in the catalog.
GE系统比现有的记录器有更大的记录容量，是第一个满足新的联邦飞行管理局(FAA)飞行记录器法规的产品，一位代表说。
The GE system has a greater recording capacity than existing recorders and is the first to meet new Federal Aviation Administration (FAA) flight recorder regulations, says a representative.
有代表性的是，产品设计人员不知道人们实际上如何使用产品，甚至很少知道用户的需求和目标。
Typically, product designers have little knowledge of how people will actually use the product and even less about the end users' needs and goals.
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