Zd
n. 天顶距（zenith distance）；零色散（Zero Dispersion）
🗣️ 情景例句
I'll chop the onions.
我要去切洋葱。
I can't seem to get to sleep.
我好象睡不着。
In this way self-confidence grows, first from mastering a subject, then from being able to take about it.
这样，你自信心不断增强，先是因为掌握一门学问，接下来是因为能够就此发表见解。