It is already obvious that all four American systems have leapfrogged over the European versions. [VERB prep.]
4个美国系统全部超过了欧洲版本,这已是显见的事实。
American researchers have now leapfrogged the Japanese and are going to produce a digital system within a year or two. [VERB noun]
美国研究人员现已乘日本人之东风赶超而上,将在一两年内研制出一套数字系统。
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