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What is rotation?
Rotation (xuá n Zhu), the basic explanation: an object moves in a circle around a point or an axis. For example, the earth rotates around the earth's axis and also around the sun. (Xinhua Dictionary (1 1 Edition) and Modern Chinese Dictionary (7th Edition) are pronounced as Xuán Zhu m \u n;; But the world turns to Zhu) In mathematics, rotation is a graphic movement.

detailed description

1. refers to work around.

"Huai Nan Zi's Original Tao Xun": "The so-called weak will is strong ... carefree, motionless, rotating with everything."

"Hundred Similes Classic": "The boat can't turn in."

Qing Ji cloud "Five Chapters of Caotang Summer in Luanyang" notes: "If the sun and the moon turn, there will be a meeting."

Mao Dun's A Woman: "Qionghua nodded noncommittally and didn't speak. Other things are spinning in her mind. "

Ai Qing's hymn: "Let's spin like a flywheel every day."

2. twist.

Li Mingzhi's Answer to Deng Mingfu: "Only when the door is firm can I master the right of this rotating machine."

"Xie Duo Chuan" in the Ming Dynasty: "It is forbidden to shake the wall, and the city gate is a disaster. Regardless of movement and rotation, it can answer the hope of heaven and man. If so, you can be sincere and fearful. "

Du Pengcheng's "Defending Yan 'an" Chapter 4: "Let them change from human beings to soldiers in the rotating world. "

Ye Shengtao's "Mr. Pan is in trouble" I: "When he turned around, he saw no son and wife behind him."

3. refers to dizziness.

Chapter 9 of Liu's The Fire Ahead: "He was very upset and suddenly his mind was spinning."

4. Jude mediated.

Huang's "recent secret political news": "Whenever the presidential palace negotiates with the State Councilor, this gentleman will vigorously rotate."

5. On the plane, a figure rotates an angle around a vertex in a certain direction, which is called rotation.