当你躺在床上,听着窗外滴滴答答的雨声,不一会儿你就会觉得睡意渐浓,很快进入梦乡。这种类似的情况还有:当夜深人静的时候,只能听到闹钟滴答的声音,开始你还觉得吵,可不知不觉你便进入睡眠状态;再比如坐火车去旅行,开始时很兴奋,还能欣赏窗外的景色,当听到火车驶过钢轨有节奏的声音时,渐渐就会感到困倦。 When you lie in bed, listening to the rain of the ticking outside the window, soon you will feel drowsy gradually, and soon fall asleep. This is similar to the situation: When the dead of night, you can only hear the sound of alarm clock, at first you still feel noisy, but you can sleep without knowing it; Another example is to travel by train, very excited at the beginning, You can also enjoy the scenery outside the window. When you hear the rhythmic sound of the train passing the rails, you gradually feel sleepy.