三角函数弧度制 扇形面积 弧长 公式不要复制过来的,要原版

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• 三角函数弧度制 扇形面积 弧长 公式不要复制过来的,要原版
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• 英语翻译翻译：My mother taught me that we must always let older people go through doorsfirst.young people just push past everybody mow.They are all the same.unlike people of our age,young people today don't have good manners.Mr Wu approaches and sits down at one end of the bench.He puts his feet up on the bench.Then he begins eating noodles from a container.He slurps them into his mouth noisily.He chews with his mouth open.He drops food onto the ground