After drifting lower at a sleepy pace for most of the day, the Dow Jones industrial average abruptly lurched into a hair-raising sky dive in the final hour of trading.

漂流后在一个沉睡的速度降低最多的一天，道琼斯工业平均指数节节突然变成令人毛骨悚然的天空潜水在交易最后一小时。

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But the first officer, still believing that the object in the sky above him was the cargo plane, initiated a dive to avoid the perceived imminent collision -- sending the jetliner toward the Air Force plane.

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