只是等到他尝了知识树上的果子，进而充分吸收之后，对于家具和装饰的外在需求才得以不断增长。
It is only since his tasting of the fruit of the tree of knowledge, and till he can fully digest it, that man's need for external furniture and embellishment persistently grows.
用例技术是通过用例、参与者与用例以及用例之间的关系来描绘系统外在需求的一种方法。
The technique of the use case is a method to describe external requirements of system by use case, the relationship between actor and use case, and the relationship between use cases.
更进一步地说，在本例中，活动是需求的外在因素。
Further, in this example, the activity was an explicit element of the request.
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