A writing or drawing instrument with a graphite or colored core, usually encased in wood and sharpened to a point.

用于书写或绘画的工具，内芯为石墨或彩芯，通常包木并削成尖端。

To write or draw using a pencil.

• To mark lightly or sketch in outline.

用铅笔书写或绘画。

• 轻轻标记或勾勒轮廓。

A paintbrush; archaic or literary use.

画笔；古旧或文学用法。

A narrow bundle or set of light rays; technical.

一束或一簇较窄的光线；术语用法。

A family of geometric objects sharing a property, e.g., all lines through a point; mathematics.

具有共同性质的一族几何对象，如过同一点的所有直线；数学用语。