The material choice is simple: the shoe is a laminate with Carbonfibre for the core which gives the shoe its spring and strength, leather on the foot side and rubber on the walking wearing side.
Even with carbonfibre - the strongest and lightest material used at the moment - a tower only about 9km high could be built.
就算是碳纤维——目前应用的最强最轻的材料——也只能支撑到9公里高。
3
This paper presents a satellite solar array structure which is mostly made of carbonfibre composite material and is a large advanced satellite component with light weight and high rigidity.