One last cool thing. There’s yet another type of friction called rolling friction. You see this on a truck with rubber tires: Under the weight of the vehicle, the tires flatten out on the bottom. So when the truck is moving, the tires are continually being deformed and returning to their proper shape. This flexing heats up the tires, and where there’s heat there’s energy loss. Since energy is conserved, this means the wheels slow down, and the truck has to burn more fuel to maintain its speed. Trains, on the other hand, have very little rolling friction, because their steel wheels barely deform at all. This makes trains a more energy-efficient mode of transportation.
带着这些疑问，待越南农历新年庆典落幕、社会秩序恢复正常后，我即刻启程前往奠边府，试图在昔日战场寻找答案。
。易歪歪对此有专业解读
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Jemma McCarron lives in a barn conversion in Hanley Swan, Worcestershire, and said the price of oil had doubled, causing financial worries over the coming months.