If someone takes an ordinary bicycle and changes the wheels so it can go faster, we can say it was souped up.

那我的自行车也该换换车胎了。

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The ordinary 'horseless carriage' is at present a luxury for the wealthy; and although its price will probably fall in the future, it will never, of course, come into as common use as the bicycle.

最近出现的“无马客运”（老式汽车）只是给富人用的奢侈品，当然未来他的价格会降一些，但无论如何汽车永远也不会像自行车那样适合大众。

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