Collineation
直射（变换）, 同射变换
🗣️ 情景例句
without cultural programs in our school.
我们的学校里没有文化活动。
Whatever is worth doing at all is worth doing well.
凡是值得做的事，就值得做好。
But, in addition to that basically simple concept,
除了这一基本的简单的概念外，