One way to think about it, actually, it's quite easy, you mentioned that you're walking on the outside of the cylinder along C prime.

有一个办法想起来就很简单，假想你在圆柱外,绕着曲线C走。

youdao

It helps the body bend towards the ground and sideways, and is the prime mover for lifting the leg up when walking.

它可以帮着身体向地面和侧面弯曲，也是走路抬脚的主要动力。

youdao

Prime location, walking distance to schools and shopping centers.

优越的地理位置，可步行到学校和购物中心。

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Canada's Prime Minister Stephen Harper, who in opening the summit said nations are walking an economic "tightrope."

VOA: standard.2010.06.27

When Hall of Fame baseball pitcher Randy Johnson took the mound during his prime, he was known as The Walking Infirmary.

FORBES: Warmists Display Cowardice and Hypocrisy In Avoiding Global Warming Debate

But today I met the Prime Minister here in London and my feeling is that - no, very fortunately, the world is not walking away from Afghanistan and not listening its attention to Afghanistan.

BBC: Breakfast with Frost