当然，这应该受到业务主管单位提供的约束条件和指导原则的限制，并且通过所选择的技术进行实现。
Of course this should be within the constraints and guidelines provided by the sponsoring business units, and with the enablement of the chosen technologies.
第一个限制条件是必要的，因为其他的选择——传递参数给某一portlet、portlet消息或portlet操作——在修改门户网站页面时并不可用。
The first restriction is necessary because the other alternatives — passing parameters to a portlet, portlet messages, or portlet actions — are not available when changing a portal page.
个体选择发生在一个“既定条件”的环境下——即一些为个体所接受作为选择基础的前提；而行为只有处于由这些“既定条件”所设定的限制之中才是适合的。
Individual choice takes place in an environment of 'givens' — premises that are accepted by the individual as bases for choice; and behavior is adaptive only within the limits set by these' givens. '.
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