这项研究的参与者选择只看天或只看身体，没有人两者都看，当然现实世界为我们提供了更为完整的画面。
While participants in the study had the option of looking only at either head or body-but not both-the real world offers us a more complete picture of people, of course.
在团队的成果中，没有人知道完整故事的始末。
例如，登录就不是完整的用例，因为没有人会仅仅想要登录而进入系统。
Logging on is not a full-blown use case, for example, since nobody walks up to the system with the intent of doing nothing but logging on.
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