Zd
n. 天顶距（zenith distance）；零色散（Zero Dispersion）
🗣️ 情景例句
Oh, Pete, Pete!
噢 Pete Pete
Once an opportunity slips away, it is gone for good.
机会一旦错过，永远不会再来。
Suddenly, there was a slight trembling sound from below, and the captain went down to see what had happened.
突然，从船舱下部传来一声微颤音，船长走下船舱去查看究竟。