Gyroscopic Stabilization Wheeler Self Balancing 平衡車

 Balancing Control of Two-Wheel Bicycle Problems

 https://www.hindawi.com/journals/mpe/2020/6724382/

 https://en.wikipedia.org/wiki/Control_moment_gyroscope

https://en.wikipedia.org/wiki/Gyroscope 

https://en.wikipedia.org/wiki/Center_of_gravity_(disambiguation)

https://en.wikipedia.org/wiki/Ship_stability