According to Aristotle, movement in nature is classified into two kinds: natural movement and forced movement.

亚里士多德先生说：自然界的运动有两种，一种是天然运动，一种是被迫运动。

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The rider maintains a light, soft and steady contact with the mouth, allowing the natural movement of the head and neck.

骑手通过缰与马嘴保持轻柔而且稳定的接触，允许马的头与颈自然的移动。

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Also the paper explains the concepts of "natural movement", "virtual community" etc, that established in the practice of space syntax.

本文亦简要解释了空间句法在实际应用中形成的“自然运动”、“意念社区”等概念。

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Experts explain that the movement of air in the atmosphere and natural qualities of the human eye caused him to see markings that were not there.

VOA: special.2010.07.11

"The dancer of the future will be one whose body and soul have grown so harmoniously together that the natural language of that soul will have become the movement of the body.

VOA: special.2010.08.29

The new suits should allow far more natural movement than suits did in the Apollo era.

NPR: NASA's Future Spacesuits Are Made for Walking

The "dances, " which give the deceptive impression of being little more than heightened natural movement, are as well suited to the characters as the songs that they sing.

WSJ: Small-Town Dreams | Hands on Hardbody | Brooks Atkinson Theater | Happy Birthday | TACT/The Actors Company Theatre, Beckett

The good weirdness of the natural birth movement is inevitably overshadowed by the vaccine debate, a debate which weaves together strands of American individualism and radicalism with the inevitability of distrust in a system as diverse and disparate as our own.

FORBES: Vaccines and the Weird Cultural Landscape of America