Collineation
直射（变换）, 同射变换
🗣️ 情景例句
I'm thirty.
我三十岁。
In the mirror we see the face; in wine, the heart.
明镜照容颜，醇酒见人心。
The man who, in old age, can see his life in this way,
上了年纪的人这样看待生命，