Your body is young, so it has strong muscles and bones.
你的身体很年轻，因此肌肉和骨骼很结实。
You can feel it in your bones and muscles.
你可以从你的骨骼和肌肉中感受到它。
With no gravity exerting itself on the body, both bones and muscles begin to waste.
由于没有重力施加于身体上，骨骼和肌肉都会废退。
It can help control weight and maintain healthy bones, muscles and joints.
它能够帮忙控制体重和持续健康的骨骼，肌肉和关节。
A healthy body has healthy bones, muscles and skin.
一个健康的身体有健康的骨骼，肌肉和皮肤。
Skeletal muscles help hold the bones of the skeleton together and give the body shape.
骨骼肌把骨架的各种骨头组合在一起，使人体有了一个形状。
Skeletal muscles help hold the bones of the skeleton together and give the body shape.
骨骼肌把骨架的各种骨头组合在一起，使人体有了一个形状。
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