可供选择的概念发动机——可变压缩比发动机可以提供给汽车制造商现实的选择来混合使用

Alternative engine concepts——Variable compression ratio engines could offer carmakers a realistic alternative to hybrids

汽车制造商在一定程度上不是能够承担风险的公司。设计车辆需要高投资而利润率却很小，产生的回报也很低。所以他们通常很谨慎。

Carmakers are not the sort of companies to take unnecessary risks. Developing vehicles requires high levels of investment while small profit margins produce low levels of return. They are naturally very conservative.