black box calf
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它们被称为黑匣子。
They're known as the black box.
当飞机从空中坠落，比如2009年6月30日的一架也门客机在飞往印度洋的科摩罗群岛时那样，黑匣子是找出问题所在的最佳选择。
When planes fall from the sky, as a Yemeni airliner did on its way to Comoros Islands in the India ocean June 30, 2009, the black box is the best bet for identifying what went wrong.
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