通道是两个端点间被命名的连接。

A channel is a named connection of two endpoints.

youdao

将一个端点连接到基准线，一个端点连接到第一个部件。

Attach one endpoint to baseline and one to first feature.

youdao

将一个端点连接到基准线，一个端点连接到第一个部件。

Attach one endpoint to baseline and one to first feature.

youdao