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.

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在减少排放温室气体方面，巴西的甘蔗造乙醇表现比玉米造乙醇好得多：壳牌声称，汽车每英里所耗燃料，甘蔗造乙醇比汽油产生的二氧化碳少70%。

Brazil's sugarcane ethanol performs much better than ethanol made from maize in that respect: Shell claims it produces 70% less carbon dioxide than petrol, mile for mile.

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如果希望某种技术在商业利用方面切实可行，首先在物料的预处理方面要求所得到的中间产品必须是容易发酵的糖份，产量高，浓度也较高，而且技术的实施成本还不能过高，还有生产过程中更不能使用有毒物质，不可以耗费太多能源，最后，所生产出来的草料油在价格方面必须能够与传统汽油一争高下。

They should not use toxic materials or require too much energy input to work. They must also be able to produce grassoline at a price that can compete with gasoline.

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