慢速英语:Longer Battery Life Among Apple iOS9 Updates

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短语讲解：

1. And be sure to back up your device before updating.

back up 支持，后援
例句：Don't back up the moment you run up against a little difficulty.
不要遇到一点困难就打退堂鼓。

2. iOS 9 makes good use of the iPad screen size, now allowing you to do two things at once.

at once 立刻; 立即; 同时
例句：Let s pack up and start at once.
让我们整理好行李立刻出发。

3. Now you can ask Siri to find photos based on place names, dates or album titles: "Siri, find me photos of Alaska from 2013."

base on 使建立在…基础上
例句："Base on Yunfu, orient to the world and aim at the future."
立足云浮,面向世界,走向未来。

4. A new Low Power mode will try to make your battery last as long as possible before you can get to a power supply.

as long as 只要; 如果; 既然
例句：As long as we are united, there is no difficulty we cannot overcome.
只要大伙儿拧成一股绳, 没有克服不了的困难。

5. Although the Apple Watch was supposed to get an update to its operating system with Watch OS 2 at the same time as iOS 9 was released, the Watch update has been postponed.

at the same time 同时; 一起; 但是; 然而
例句：There will be another cause for rejoicing at the same time.
似乎可能还要双喜临门。