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Today is Frday.It is 3:00 in the afternoon.We have many clubs in our school.Look! Some boys of sports club are playing soccer.Others are riding bikes.In the art club,some girls are drawing pictures.Look at those girls in music ciub.They are standing and singing a song.The teacher is playing the piano.It's our favorite day today because we are all very happy. 打这不容易啊！望采纳！希望能帮到你O(∩_∩)O~
飞机对着球排气，使小球顶部的气体流速慢于两旁，流速越大压强越大，气体压强使小球不会轻易跌落。
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