vertex造句
A
vertex with zero outdegree is called a sink.
出度為零的頂點稱作收點.
Vertex a is the initial
vertex and b is the terminal vertext.
a頂點是始端頂點,而b是末端頂點.
An edge corresponds to a corridor and a
vertex to the conjunction of several corridors.
邊對應于走廓,而頂點對應于幾條走廓的相交點.