Zd
n. 天顶距（zenith distance）；零色散（Zero Dispersion）
🗣️ 情景例句
Don't worry, Richard.
别担心， Richard。
It was eleven o'clock when he finally showed up.
他最后露面时，已经11点钟了。
CUSTOMS OFFICER: Are these your cases?
这些是你们的箱子吗？