49. extra额外的 外加的 特别的
We should take extra time and spent extra money to build disaster safety into our lives.
50. factor因素 要素
Which according can most seriously endanger airplane according to this passage?
51. failure失败 失败的人或事 失灵 故障
What were the circumstances? Were they bad weather, a fire, or engine failure?
Apparently, there were some lower clouds in area, but mostly it was just miscommunication between the pilots and the traffic controllers.
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