Smartphone battery down to 10 percent? Time to turn down the brightness on the screen, right? It's a classic strategy to squeeze more juice from the battery. And it works. But that trick might be less effective than you think.
智能手機(jī)才10%的電量了？該把屏幕調(diào)暗了，對(duì)吧？這是爭(zhēng)取更多電量典型的方法，而且切實(shí)可行。但那招沒(méi)你想象得那樣有效。

Because it turns out nearly half the battery drain on a phone happens when the screen's not even on. So says a study presented at a meeting of the Association for Computing Machinery.
因?yàn)槭聦?shí)上將近一半情況是屏幕暗著，但電池依然消耗著。美國(guó)計(jì)算機(jī)協(xié)會(huì)一次會(huì)議上發(fā)布的研究如是說(shuō)。

Researchers eavesdropped on the activity of more than 1,500 Android phones—specifically, the Samsung Galaxy S3 and S4. They used an app they developed called eStar Energy Saver. The app logs the energy drain of the phone's apps and activities as they happen.
研究人員用他們研發(fā)的eStar能源節(jié)約助手監(jiān)聽(tīng)了超過(guò)1500部安卓手機(jī)的活動(dòng)——具體說(shuō)來(lái)是三星Galaxy S3和S4。這個(gè)應(yīng)用記錄手機(jī)電池消耗情況及耗電時(shí)相應(yīng)手機(jī)應(yīng)用的狀態(tài)。

They found that some 45 percent of the battery drain happened while the screen was off. A lot of that energy suck was apps updating in the background—downloading headlines and weather, while you're not actively using them.
研究發(fā)現(xiàn)有大約45%的電池消耗情況發(fā)生在屏幕暗的時(shí)候。許多電量不足是因?yàn)閼?yīng)用在后臺(tái)更新——比如下載標(biāo)題、更新天氣，而事實(shí)上你根本沒(méi)一直開(kāi)著這些應(yīng)用。

And different versions of the same app require different energy supplies. For instance, some versions of the Facebook app were twice as energy thirsty as other versions. So app version choice could slow your battery drain.
此外，同一個(gè)應(yīng)用的不同版本對(duì)電量的要求也不盡相同。舉例子說(shuō)，有幾個(gè)版本的臉書(shū)用電量是其他版本的兩倍。所以說(shuō)，選好版本也可以減緩電池消耗。

But one of the most hidden energy draws, zapping 12 percent of the battery, was just cellular paging: the pings from a cell tower every 1.28 seconds, that tell your phone if a call or message is on the way. Which is, ultimately, the price of being connected.
但最為隱蔽的電源消耗是蜂窩尋呼，可以用掉12%的電池，即手機(jī)信號(hào)塔每1.28秒就發(fā)一次的聲脈沖，提示你來(lái)電或者有短信。這歸根結(jié)底就是保持通信順暢的代價(jià)。