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。
Avoid BRIGHT LIGHTS - if you wake up in the middle of the night and can't get back to sleep within 30 minutes, get up but avoid as much light as possible.
避免强光—如果半夜醒来后30分钟内不能再次入睡的话，干脆起床，但一定尽量避免强光。
A huge smile lights up Hawking's bespectacled face, but he cannot wave or shout back.
霍金戴着眼镜面露笑容，但他无法挥手或回喊答礼。
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