Collineation
直射（變換）, 同射變換
??? 情景例句
who really needs to be wearing a tuxedo,
真正需要穿燕尾服的人，
I did Math this morning.
我今天早上做算術(shù)。
Excuse me. I've lost my cat. Have you seen it anywhere?
打擾了。我的貓丟了，你在哪見過(guò)嗎？