白炽灯能瞬时点亮，使正睡在凌乱的床上的人感到震惊，同样它们被即刻熄灭(“噢，对不起！”)，使得老人一下绊倒在楼梯上。
They were instantly on, shocking the rumpled sleeper in his bed, and as instantly off (" Oh, sorry! "), tripping the pensioner on the stair.
长时间观看高清电视或快速滚动手机屏幕也可能以某种方式改变人们的平衡感，使他们更容易绊倒和摔跤。
Lengthy viewing of high-definition televisions or scrolling wildly on a phone might also somehow alter people's sense of equilibrium, making them more likely to trip and fall.
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