A flat straightedge with measurement markings.

• A tool for drawing straight lines and measuring length.

带刻度的直尺，用于测量长度。

• 用于画直线的工具。

A person who governs a country or people.

• A monarch or other supreme leader.

统治国家或人民的人。

• 君主或最高领导者。

To strike someone with a ruler as punishment.

• Often used in old-fashioned school discipline.

用尺子打人作为惩罚。

• 多见于旧式学校体罚。