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中学物理学习过程中,经常遇到一些有关包络线的问题,文章简单谈了旋转圆中的边界线、安全抛物线和马赫锥等常见的包络线.
In the course of middle school physics learning, we often encounter some problems about the envelope. The article briefly talks about the common envelopes such as the boundary line in the rotating circle, the safety parabola and the Mach cone.