A drawing or plan that explains how something works or is arranged.

• A chart or graph showing quantitative relationships.

解释事物工作方式或结构的图示。

• 显示数量关系的图表。

To represent or explain something using a diagram.

• British rail: to schedule locomotive or train operations.

用示意图或图表表示或说明某事。

• 英式铁路用语：安排机车或列车的运行计划。

Category theory: a functor from an index category to a category.

• Encodes the pattern of objects and morphisms.

范畴论：从指标范畴到某范畴的函子。

• 刻画对象与态射的连接结构。