然而，如今电动汽车技术得到最新发展，这意味着它们在性能和安全性方面都可以与传统汽油发动机相媲美。
Now, however, recent developments in electric vehicle technology mean they can match conventional petrol engines in terms of performance and safety.
较一个类似传统汽油发动机汽车的行程成本的两倍多的钱，提高能源电池存储量允许汽车制造商使用更小的电池组，从而降低成本。
Increasing the amount of energy that a battery stores allows an automaker to use a smaller battery pack, thereby reducing costs.
比较起来，使用传统内燃发动机燃烧氢比燃烧汽油更容易。
By comparison, getting a conventional internal-combustion engine to burn hydrogen instead of petrol is relatively easy.
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