打开无线网络、把iPad的屏幕调亮并保持亮度、同时播放音乐的情况下，你也可以用iPad看几乎12个小时的电子书。如果把无线网关掉，持续时间还会增加半个小时。
With WiFi on and its screen set to stay illuminated, the review iPad lasted for almost 12 hours while playing music; leaving WiFi off added about half an hour.
人们很容易降低窗户的亮度以保持凉爽。
People could simply make the windows less bright to stay cool.
深色可以给火焰增加亮度，而且要确保你的注意力在火焰本身上，保持背景的简单是很重要的。
A dark color adds intensity to the fire and keeping the background simple to begin with is important to ensure that you concentrate on the fire itself.
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