Zd
n. 天顶距（zenith distance）；零色散（Zero Dispersion）
🗣️ 情景例句
The annual school sports meet is held in March.
每年一次校运会在三月份举行。
Forget it!
算了！
Hi, Lin Tao! What are you going to do on Sunday?
嗨，林涛！星期天你打算干啥？