On the rocking motion and its dynamic evolution of a swept delta wing
后掠三角翼的摇滚及其动态演化问题
Mom was singing a lullaby to my baby sister while rocking the cradle with a gentle backwards and forwards motion.
妈妈给我的小妹妹唱摇篮曲，并且轻轻的前后摇动摇篮
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