科学美国人60秒:智能手机黑屏状态也耗电-托福听力下载

　　科学美国人60秒中文翻译：

　　Smartphone battery down to 10 percent? 智能手机电量就剩下10%?

　　Time to turn down the brightness on the screen, right? 得调低屏幕亮度对不对?

　　It's a classic strategy to squeeze more juice from the battery. 这样做能够从电池里挤点电量出来。

　　And it works. 而且有作用。

　　But that trick might be less effective than you think. 但这个小把戏也许并没你想象中那么有效。

　　Because it turns out nearly half the battery drain on a phone happens when the screen's not even on. 因为事实上手机电量的消耗几乎有一半是在屏幕关闭的状态下。

　　So says a study presented at a meeting of the Association for Computing Machinery, in Portland, Ore., 美国俄勒冈州波特兰市计算机协会的一次会议上发表的某项研究也提出了这样的观点。

　　Researchers eavesdropped on the activity of more than 1,500 Android phones—specifically, the Samsung Galaxy S3 and S4. 研究人员窃听到三星Galaxy S3和S4两款主流机型超过1500部安卓手机应用的使用情况。

　　They used an app they developed called eStar Energy Saver. 他们使用的是自主研发的一款名为eStar节能的应用。

　　The app logs the energy drain of the phone's apps and activities as they happen. 这款应用程序能够记录手机应用及进行其他活动时的电量消耗状况。

　　(And you can try out eStar Energy Saver yourself, if you have an Android.) (如果你的手机也是安卓系统，你也可试试这款应用。)

　　They found that some 45 percent of the battery drain happened while the screen was off. 他们发现在手机屏幕关闭的情况下45%的电量被消耗掉。

　　A lot of that energy suck was apps updating in the background—downloading headlines and weather, while you're not actively using them. 很多电量都是某些应用在后台更新时消耗掉的—比如你下载头条、天气信息并未使用手机时。

　　And different versions of the same app require different energy supplies. 相同应用不同版本的电量消耗也存在差异。

　　For instance, some versions of the Facebook app were twice as energy thirsty as other versions. 比如有些版本的脸书应用的电量消耗是其他版本的2倍。

　　So app version choice could slow your battery drain. 因此应用程序版本的选择可能会降低电量消耗。

　　But one of the most hidden energy draws, zapping 12 percent of the battery, was just cellular paging: 但是最能耗电的其中一款应用则是耗掉近12%电量的蜂窝寻呼：

　　the pings from a cell tower every 1.28 seconds, that tell your phone if a call or message is on the way. 每1.28秒来自发射塔的因特网包会通知你的手机是否有电话或信息。

　　Which is, ultimately, the price of being connected. 而这是你使通信畅通最终所付出的代价。

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