英语句式讲解
In China and North America,where heavy haulage and high speed are regarded as the tendency of railway development,most of the diesel-powered locomotives are diesel-electric.
求大神分析这个句子（翻译,重点短语,短语的相关用法,句式结构特点,比如什么充当什么成分,越详细越好）明天考试需要上台讲解,急用,