Apochromats
n. 高度消色透镜
🗣️ 情景例句
So save your voices till then.
所以， 留着点嗓子。
A woman's work is never at an end.
妇女的活计做不完。
The study of custom can be profitable only after certain preliminary propositions have been accepted,
只有在某些基本的主张被接受下来、同时有些主张被激烈反对时，