来自《耶鲁大学开放课程：生物医学工程探索 第19集 第19集》
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all of the weight of your body is on that one leg.身体所有重量都在一条腿上 -
The whole weight of your body is on the femur,所有重量都在股骨上 -
the whole weight of the body is actually right here.整个身体的重量都集中到那里 -
The whole weight of your body is on this very small--都集中到了这个很小的 -
depends on the integrity of that very small piece of material.都依赖这非常小的一块材料来支撑 -
What we learned last time is that materials have elasticity.我们上次学过材料有弹性 -
You don't want something that bends a lot there.你不会希望这是种易弯曲的材料 -
You want something that's strong, that doesn't bend,你希望它很坚固 不会弯曲 -
even when there's a high stress applied to it即便承受由体重产生的高压 -
like the stress of the weight of your body.也不会变形 -
Metals are really the materials因此金属是不二之选 -
that best can supply that kind of mechanical strength,它能提供那种很高的机械强度