And, sometimes, a time stamp or last viewed stamp does matter.
而且，有时候，时间戳或上次查看的时间确实有用。
To help users rapidly identify the task associated with each app, the list shows a snapshot of its actual state when the user last viewed it.
为了帮助用户快速识别与每个应用程序相关的任务，列表显示了当用户上次离开应用的时候，它实际状态的快照。
Consider what happens in your browser history when you use the Back button: the browser returns to the last viewed page, and the forward button, which was previously disabled, lights up suddenly.
想一想使用后退按钮时历史堆栈中会发生什么：浏览器返回上一次查看的页面，原来不能用的前进按钮突然之间变得可用了。
Today, local residents will have a chance to observe the transit of Venus in Shanghai, a rare astronomical wonder that was last viewed from the city 138 years ago.
今天，在上海的居民们有机会观察到“金星凌日”这一罕见的天文奇观。上一次上海出现这一奇观还是在138年前。
Today, local residents will have a chance to observe the transit of Venus in Shanghai, a rare astronomical wonder that was last viewed from the city 138 years ago.
今天，在上海的居民们有机会观察到“金星凌日”这一罕见的天文奇观。上一次上海出现这一奇观还是在138年前。
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