Having virtual controls allows more space for the content when you don't need the controls, and allows richer interactions that connect better with users expectations.
拥有虚拟控制可以让你在不需要它们的时候给内容提供更多的空间，支持更丰富的交互，更符合用户的预期。
They include “high expectations, ’’ “content knowledge’’ and ability to maintain “culturally sensitive’’ classrooms.
它们包括”高期望值“、”学科知识“和保证教室的”文化敏感“。
Parts 2 and 3 focus on the actual content being sent to the user and how to make that content match the expectations of an iPhone or iPod touch user.
第2和第3部分集中讲解了实际发送给用户的内容，以及如何使这些内容符合iPhone或iPod touch用户的期望。
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