Zd
n. 天顶距（zenith distance）；零色散（Zero Dispersion）
🗣️ 情景例句
He has been friendlier lately.
他近来更友好了。
Up to you.
你说了算。
I'm talking. You are not talking. You're listening to me .
我在说话。你没在说话。你在听我说话。