Tetartohedry
四分對稱
??? 情景例句
I'm looking for the house.
我正在找他的房子。
He that liveth wickedly can hardly die honestly.
生而缺德，死必寡誠。
Everyone knows that if he shouts in the vicinity of a wall or a mountainside, an echo will come back.
大家都知道，在墻壁或山腰附近發出的喊聲，就會聽到回聲。