交界处的英文：
edge

The sinoatrial node is located at the junction of the superior vena cava and the right atrium
窦房结位于上腔静脉与右心房的交界处。

The interface between air masses of different temperatures or densities.
锋面不同温度、密度的两大气团交界处

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

The knife's edges have blunted.
这刀刃已变钝了。

Gripper edge: Edge of a sheet to be gripped by the grippers of a printing machine.Also called Feed edge,Leading edge.
夹牙边:被印刷机上的夹牙抓牢的纸边。亦称前纸边，纸头。