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After several delays, the plane's black boxes have now arrived in the UK after the rebels handed them to investigators.
這架飛機的黑盒子從叛軍手中交給調查人員之後，經過了幾天，現在已經送抵英國。

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And what happens next here is experts will analyze the information contained on those devices, but information learned from that could take weeks.
接下來進行的是，專家會分析那些儀器收錄的資訊，但從中得知的資訊可能要費時數週。

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CNN's Rachel Crane takes a look at why black boxes are so crucia to an investigation after a plane goes down.
本台記者芮秋．克雷恩要看看為什麼在飛機墜毀後，黑盒子對調查工作這麼重要。

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Following a plane crash, the search for survivors always comes first.
在發生墜機事件後，尋找生還者一定是第一要務。

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But just as important is the search for answers -- the why and the how.
但是同樣也很重要的是尋找答案，事故為什麼會發生以及怎麼發生的。

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Often, those answers are found in the black box.
通常那些答案可以在黑盒子裡找到。

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Since the '60s, all commercial airplanes have been required to have one on board.
從六○年代以來，所有的商務飛機都被要求機上必須配備一具黑盒子。

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Now, the name is a little misleading, because they're actually orange.
這個名稱會有點讓人誤解，因為它們其實是橘色的。

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And when we're talking about a black box, we're talking about two different boxes --
而且雖然我們說一具黑盒子，但其實是兩個不同的盒狀物，

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one being the cockpit voice recorder, the other being the flight data recorder.
一個是駕駛艙通話記錄器，另一個是飛行資料記錄器。

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Together they weigh anywhere between 20 to 30 pounds and they have to be crash-proof.
這兩個總重量在二十磅到三十磅之間，而且必須能防撞擊。

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Black boxes can survive just about anything --
黑盒子幾乎什麼狀況都不會損壞，

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temperatures up to 2000 degrees Fahrenheit for an hour, forces that are 3,400 g's; now, it's 3,400 times the force of gravity.
可承受高達華氏二千度一小時、重力加速度三千四百 g，也就是地心引力的三千四百倍。

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They're waterproof and they can save recorded data for two years. And it's a lot of data.
黑盒子能防水，而且可以保存紀錄的資料兩年。裡面的資料可多了。

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The cockpit voice recorder records the crew's conversation and background noise.
駕駛艙通話記錄器會記錄機組人員的對話和背景聲音。

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By listening to the ambient sounds in the cockpit before a crash, experts can determine if a stall took place, the RPMs of the engine and the speed at which the plane was traveling.
藉由聆聽墜機前駕駛艙的環境音，專家能研判是否發生失速、引擎每分鐘轉速，以及飛機行進的速度。

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When these sounds are cross-referenced with ground control conversations, they can even help searchers locate a crash site.
把這些聲音和地面控制中心的對話交叉比對，甚至能協助搜救人員判定墜機地點。

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Then there's the flight data recorder.
再來是飛行資料記錄器。

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It gathers 25 hours of technical data from airplane sensors, recording several thousand discrete pieces of information --
它會從飛機的感應器收集二十五個小時的技術性資料，記錄數千筆間斷資料，

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data about the air speed, altitude, pitch, acceleration, roll, fuel, and the list goes on and on.
這些數據包括風速、高度、俯仰、加速度、滾轉、油料等等，項目繁多不及備載。

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But to make sense of the data, first you have to find it -- not an easy thing to do when a plane crashes into the ocean.
不過，要解讀這些數據，首先得要找到它，如果飛機墜入海中，這可不是件做起來容易的事。

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Both black box components are outfitted with underwater locater beacons, which self-activate the moment they come into contact with water.
黑盒子的兩個組件都裝備了水底定位信號器，一接觸到水就會自行啟動。

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They send pings once per second to signal their location
它們每秒會送出一次脈衝，以信號昭示所在位置，

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and can transmit data from as deep as 20,000 feet for up to 30 days, when their batteries then run out.
並且可以從深達二千英尺處傳送訊號長達三十天，電池耗盡的時候。

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But on land, there's no such pinging to help guide the search.
但是在陸地上，就沒有這樣的脈衝來協助引導搜尋。

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Investigators have to sift through the wreckage until they find it.
調查人員必須在殘骸中仔細篩檢直到找到為止。