骑缝的英文：
a junction of the edges of two sheets of paper; perforation

junction是什么意思：
n. 交叉路口，汇合处；连接；接合点

josephson junction logic gate
约瑟夫逊结逻辑门电路

The cars collided at the junction.
汽车在交叉路口相撞。

They saw the junction of the Mississippi and the minnesota.
他们看到了密西西比河和明尼苏达河的汇合处。

edges是什么意思：
n. 边，边缘；刀，刀口
v. 使徐徐移动；给...加边

The number of incoming edges is equal to the number of outgoing edges
进入的线数等于离去的线数。

pipe edges sewing machine
滚边缝纫机

Sloth turneth the edge of wit
懒惰会磨去才智的锋芒

two是什么意思：
num. 二，两个
n. 两个人
adj. 两个的

Knit two, purl two.
两针朝下，两针朝上。

the better of the two
两者中的更好者

What does two and two make?
2加2等于几？