x-ax.isn.(名词)【复数】 x-ax.es[-2k.sôz] 【数学】 The horizontal axis of a two-dimensional Cartesian coordinate system.横坐标轴:平面直角坐标系中的水平横轴One of three axes in a three-dimensional Cartesian coordinate system.x轴:三维直角坐标系中的三轴之一