老师在黑板上画了两个每边长约10厘米的恒等三角形。
The teacher drew two identical triangles with sides approximately 10 cm long on blackboard.
通过一系列的坐标变化和近恒等变换，将电力系统的动态方程简化成三阶规范形，从而得到系统的分岔方程。
The dynamical equations of the system are simplified to a3-order normal form with a series of coordinate and approximately identical transformations, and a bifurcation equation is thus obtained.
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