根据下三角系统的结构特点，将系统每个微分方程中的高阶状态用作虚拟控制进行设计，通过循环设计最终得到系统控制所需要的控制策略。
Owing to the character of structure of lower-triangular system, the high-rank state of each differential equation is used as virtual control, then the control law is constructed by recursive design.
为了解决这个问题，我们可以通过按习惯降低三角支架(靠近鼓手的一个)使落地桶鼓和地板形成轻微的角度；见图2，这会让声波反射稍微分散。
To minimize this problem, Angle the floor Tom slightly by lowering the triangular height rod (the one nearest the drummer) to taste; see Figure 2. This causes the waves to scatter somewhat.
几何，三角，微分，积分，圆锥曲线，微分方程，和他们的多维和多元——这些都有重要的应用。
Geometry, trigonometry, differentiation, integration, conic sections, differential equations, and their multidimensional and multivariate versions - these all have important applications.
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