Collineation
直射（变换）, 同射变换
🗣️ 情景例句
And here he is--Popo the Clown.
这位就是小丑Popo。
My watch is two minutes fast.
我的表快了两分钟。
A few minutes later, I was able to hurry away with precious chalk marks on my baggage.
几分钟后，我终于被放行，手提划着宝贵的粉笔记号的行李，匆匆离去。