英语语法分析

It already built one, the Roadster, which it released in 2008.

它已经造出一辆了，那就是2008年发布的Roadster。

Overall, the Tesla Roadster achieves a battery-to-wheels efficiency of 88%.

总而言之，特斯拉跑车达到了电池电力转为轮胎扭矩的比率为88%。

Such batteries are also starting to appear in cars, such as Tesla's Roadster.

这种电池也开始出现在汽车中，比如tesla开发的Roadster。