我们知道0不能算作一个节点，如果我确实把零点画成了0，那正确的答案应该是下面的那个。

We know that the zero does not count as a node, if per se I actually had managed to hit zero in drawing that, the correct answer would be the bottom one there.

youdao

我把你算作我的一个朋友。

I count you as one of my friends.

youdao

然而，虽然像上一条那样，但是我还是一直想要一个跑车。所以把这个算作一个打算。

However, while doing that, I have always wanted a muscle car. So, will contemplate that as well.

youdao

I'm glad to hear that no one counted this r equal zero as a node.

我很高兴没听到有人把ｒ等于０这处也算作是一个节点。

麻省理工公开课 - 化学原理课程节选