Zd
n. 天顶距（zenith distance）；零色散（Zero Dispersion）
🗣️ 情景例句
How fresh are these vegetables?
这些蔬菜有多新鲜？
Who can best handle the problem?
谁能将那问题处理得最好？
He made up his mind to once again ask for her hand in marriage.
他下决心再一次向他求婚。