Tri quotient maps are a common generalization of perfect maps and open maps.
三商映射是完备映射和开映射的共同推广。
My cat is a genius, it can open a locked door. Nobody train it to open door, it just observed human behavior and learned how to do this, I am amazed for cat's intelligence quotient.
我家有只天才猫，能自己打开锁上的门，从来没有人去训练过它开门，它完全是通过观察人的行为学会了怎样开门，我对猫拥有如此高的智商感到意外。
应用推荐