(20 1 1? Xiangcheng district) Xiaoming lives in the courtyard of a family facing the street in the city, with the street facing north and south. Every spring, when the south wind blows, the streets ar

(20 1 1? Xiangcheng district) Xiaoming lives in the courtyard of a family facing the street in the city, with the street facing north and south. Every spring, when the south wind blows, the streets are thrown away. Because the pressure of the fluid is low where the flow velocity is high, and strong where the flow velocity is low, when the leaves fluttering in the wind pass by the door, the air on the street side of the leaves has a faster flow velocity and a lower pressure, and the pressure difference makes the leaves float into the yard.

So, the answer is: in the hospital; Small.