1. When we subscript an array, we are really subscripting a pointer to an element in that array. 在使用下标访问数组时，实际上是对指向数组元素的指针做下标操作。
2. A linear matrix inequality approach was developed to solve the problem addressed with an H(subscript ∞) norm bound constraint on disturbance attenuation. 基于线性矩阵不等式的方法来求解这个在扰动衰减上用一个H（下标∞）范数来约束的问题。
3. Studied the reliable H(subscript ∞) control design of dynamic output feedback control for linear systems on the basis of the linear matrix inequality (LMI). 对于线性系统，研究了基于线性矩阵不等式的动态输出反馈可靠H（下标∞）控制器设计问题。
英英解释
n.
1. a character or symbol set or printed or written beneath or slightly below and to the side of another
2. written or printed below and to one side of another character
