Sitting requires the muscles to hold the trunk, neck and shoulders in a fixed position.
坐着要求肌肉使躯干、颈部和肩部保持在固定的位置。
Because force is generated with help from the ground, bending your knees places your body in better position to produce trunk, hip, and shoulder rotation.
因为力量源自地面，弯曲你的膝盖能让你的身体处于一个更易通过躯干，髋和肩部转动获得能量的绝佳位置。
The freshwater transportation occupies an important position in the province and trunk railways radiates in all directions.
内河运输在省内居重要地位，铁路干线四通八达。
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