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这就像你用自己的力气让一艘大船前进，而它的自动驾驶仪是设置为和你向相反的方向走的。
It's like trying to turn that big boat by your own willpower when it's set on autopilot to go the opposite way.
研究者们发现除了一间教室外，所有教室都把投影仪挂于天花板上，屏幕垂直安装，这样的设置使问题更加严重。
The researchers found that all bar one of the classrooms they studied had equipment arranged in such a way as to exacerbate this problem, with projectors on the ceiling and screens mounted vertically.
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