affordance
- 网络给养;功能可见性;可视性;功能承受性;符担性
affordance-
An affordance is invariance for environment and it is a relation among space , time and action .
某个可供性是环境的不变量，是关于空间、时间和行动之间的一种联系。
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The affordance of the scrollbar clearly shows that it can be manipulated , but the only things about it that tell us what it does are the arrows , which hint at its directionality .
滚动条的启示清楚地表明它能操作，但能告诉用户其作用的唯一东西是箭头，信息都藏在箭头的方向中。