Why suitcases rock and fall over – puzzle solved 科学家解开拉杆箱摇摇欲倒的物理谜题

相信很多人都对下面的这个情景深有体会：为了赶火车或飞机，我们费力地拖着一个两轮拉杆箱向前奔跑，而箱子会左右摇晃，眼看着就要翻倒，着实让人提心吊胆。现在，科学家们已经针对这个令人费解的日常物理难题展开了研究调查，结果他们发现，避免该现象的方法可能和我们的预期有所不同。请听报道。 

It’s a common experience when dashing for a train while lugging a two-wheeled suitcase, the bag rocks alarmingly from side to side and threatens to overturn.

To explain why this happens, French researchers studied a model suitcase on a treadmill and did some number-crunching. And it turns out, that rather than slowing down, as you might expect, you should actually speed up to tame your unruly suitcase.  

Scientists say, while it’s a fun way to tackle the problem, the study could have applications with other two-wheeled things from trailers to caravans. 

词汇表 dashing 猛冲，突然奔跑

lugging 用力拖着

two-wheeled 两轮的

suitcase 行李箱，这里指拉杆箱

rocks 摇晃，摇摆

alarmingly 令人惊慌地，让人担忧地

from side to side 左右、来回地

threatens 预示着、快要发生（不好的事情）

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