这样，安装在红外光焦点运动轨迹上的热释电敏感元件被红外光焦点不断扫描而产生自主采样的热释电信号。
So, the pyroelectric sensor that is located on the moving track of the infrared focus is scanned by the infrared focus signal continuously and generates the autonomous sampling pyroelectric signal.
VM下载并显示这些影片，如同你坐在真正的显微镜前所要做的一样：在每部影片中上下调整焦点来寻找轨迹。
The VM downloads and displays these images, so that you can do just what someone sitting at real microscope would do: focusing up and down in each movie to look for tracks.
采用五点差分法计算轴对称静电透镜子午面上电位分布，再从普遍轨迹方程求得的电子轨迹出发得到透镜焦点和球差。
The five points difference method is used to calculate the voltage distribution on the meridian surface of axial-symmetrical electrostatic lens.
采用五点差分法计算轴对称静电透镜子午面上电位分布，再从普遍轨迹方程求得的电子轨迹出发得到透镜焦点和球差。
The five points difference method is used to calculate the voltage distribution on the meridian surface of axial-symmetrical electrostatic lens.
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