有二种方法可改变记录长度：用下拉菜单或专用功能键： 进入主菜单到频率轴（Frequency axis） 下拉菜单，选择 记录长度（Record length） 一项，另一个菜单将弹出，包括可能的记录长度，频率轴菜单也可在频率轴的左端，按鼠...
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real frequency axis [电子] 实频率轴
axis frequency 中心频率
imaginary axis frequency response 假想频率响应
axis-direetion Doppler frequency 轴向多普勒频率
First of all, note that the graph is symmetric with respect to midline of the frequency axis.
首先，图像以频率坐标轴的中线为轴对称。
Time labels the vertical axis of the above plot, and frequency marks the horizontal axis.
上图中，垂直轴表示时间，水平轴表示频率。
If the rover were not moving, the frequency distortions of its signals to Earth would reveal the rate of wobbling in Mars's axis.
如果探测器与火星保持静止，那么它向地球发出的信号将会产生频率畸变。由此，我们可以推算出火星轴线的扰动率。
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