购买一辆可折叠的自行车，这样也在搭乘火车后也能使用，这是我近年来最明智的决定之一，既符合健康的生活方式，又有利于降低碳排放。
Buying a folding bike so I could commute on the train has been one of the best decisions I have made in recent years - in terms of both lifestyle and carbon.
计算机模拟能把这些因素进行综合考量。这能改进设计出可折叠或是能拉货的自行车。
Computer simulations that take all of these factors into account could lead to improved designs for folding bikes with small wheels or bikes that carry cargo, Ruina says.
蚱蜢自行车是一种可折叠的电动自行车，它可以被折叠成手推车形，便于携带。复合材料的使用，保证了其硬度和强度。
Grasshopper is a foldable electric bicycle that turns into a trolley for easy transport. The use of composite materials provides rigidity and strength.
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