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Modern airplanes have two black boxes: a voice recorder, which tracks pilots' conversations,and a flight-data recorder, which monitors fuel levels, engine noises and other operating functions that help investigators reconstruct the aircraft's final moments.
出自-2010年6月阅读原文
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Although many of his specific conclusions have been 35 rejected or modified over the years, his ideas inspired thousands of studies by investigators all over the world.
2015年12月四级真题（第二套）阅读 Section A
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Although many of his specific conclusions have been rejected or modified over the years, his ideas inspired thousands of studies by investigators all over the world.
2015年12月四级真题（第二套）阅读 Section A
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But perhaps they don't have to turn themselves into private investigators or Congressional subcommittees.
2016年6月四级真题（第三套）阅读 Section B
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fire investigators have responded to the scene but have not yet determined the cause of the fire.
2018年12月四级真题（第一套）听力 Section A
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In a review of 14 studies that looked at physical activity and academic performance, investigators found that the more children moved, the better their grades were in school, particularly in the basic subjects of math, English and reading.
2016年6月四级真题（第三套）阅读 Section A