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vi.自转(旋翼机式或直升机的旋翼不借机动力自转)
1、christianisme autorise───基督教允许
1、If they lose power while flying, they can autorotate down and land without sustaining any damage due to their flexible structure that deflects upon impact.───如果在飞行中它们失去了能量,它们可以自旋下降并着陆而无需承受任何伤害,因为它们弹性构造可以使伤害转向。
1、Pines, my advisor, realized that the simplest system in nature that achieves vertical flight and can autorotate like a helicopter is the samara, which is a naturally stable system.
2、Dr. Pines, my advisor, realized that the simplest system in nature that achieves vertical flight and can autorotate like a helicopter is the samara, which is a naturally stable system.