zd
n. 天顶距（zenith distance）；零色散（Zero Dispersion）
例句
ZD hometown in Shaoshan, but "Shaoshan" two characters come from where?
ZD家乡在韶山，但“韶山”二字从何而来？
ZD soft screen Recorder is a high performance screen recording software program.
屏幕录影是一个高性能的屏幕录制软件。
The algorithm has been put to use in an automatic layout, system ZD-MCARS with satisfaction.
本算法已在ZD - MCARS自动布线系统中投入使用。结果令人满意。
