圖像加註文字,霍爾木茲海峽衛星影像。該海峽位於伊朗與阿曼之間,是連接波斯灣與阿拉伯海的戰略航道。全球近20%的石油以及25%的液化天然氣出口都經此運輸。Article InformationAuthor, 蓋文·巴特勒 (Gavin Butler) ,BBC波斯語部, 托比·曼 (Toby Mann)
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。新收录的资料是该领域的重要参考
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.。关于这个话题,新收录的资料提供了深入分析
With this, foo()'s machine code now looks like this:。业内人士推荐新收录的资料作为进阶阅读