除了可以作为控制策略外，一个切换逻辑性还可以用来描绘数字控制比如状态切换。
Switching logic in addition to adding a control strategy, a switching logic can be added to a schematic for digital control such as switch status.
如果网页中包含着需要经常查看、而且迅速更新的内容，比如查看社交网站上朋友们的状态，或者接收新闻源的最新消息，那么你就必须在不同页面间来回切换。
You have to constantly click back and forth among tabs if they contain fast-changing material you check often, like the status of your friends in social-networking services, or updates to news feeds.
呵欠还起到了使大脑状态过度顺畅的作用，比如从睡眠状态到清醒状态切换时。
Yawning additionally appears to facilitate transitional states of the brain, such as going from sleep to waking periods.
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