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A vertex with zero outdegree is called a sink.是什么意思？

A vertex with zero outdegree is called a sink.

出度为零的顶点称作收点.

相关词汇
vertex with zero is called sink

vertex

n. 最高点，顶点，<数>（三角形、圆锥体等与底相对的）顶，（三角形、多边形等的）角的顶点；

with

prep. 和，跟，随着，关于，和…一致；

zero

n. （数字）0，零度；adj. 全无的，没有的；v. . 聚焦，集中；

is

vt.& vi. 是（be的三单形式；n. 存在；

called

v. 叫( call的过去式和过去分词 )，通电话，认为，估计；

sink

vi. 淹没，下落，退去，渐渐进入；vt. 使下沉，使下垂，砸入地面，使败落；n. 水池，洗涤槽，污水坑；
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