Zd
n. 天顶距（zenith distance）；零色散（Zero Dispersion）
🗣️ 情景例句
Oh, who could that be?
啊，这会是谁呢？
I don't know what you're thinking!
真不知道你是怎么想的！
We've got to think of ways of changing people's habits.
我们得想想办法，改变人们的习惯。