The abscissa is a number on an X-axis.

横坐标是x轴上的一个数

Y-coordinate direction, abscissa intermediate region.

纵坐标的正方向，横坐标的中间区域。

The experimental curve runs nearly parallel to the abscissa.

实验曲线几乎与模座标平行。

The experimental curve runs nearly parallel to the abscissa .

实验曲线几乎与横座标平行。

Fig. 1 The staggered mesh of the shallow water equation . The abscissa is axis. The ordinate is the time.

图1 蛙跳格式的浅水方程的网格形式，横坐标为轴，纵坐标为时间。

Therefore, on the complex plane, robust stability can be formulated by minimization of pseudospectra abscissa.

于是在复平面上，鲁棒稳定性问题就转化为伪谱横坐标（伪谱最右端的横坐标值）最小的优化问题。