speed这个词是有复数形式的,它的主要意思是表示速率,速度.复数形即直接加s.
根据上面这句话：赛车手时速已超过了600英里,是表示这个速率已在600以上变化了.故用复数较为准确!如果以上没有over这个词,即用speed较为合适!
racing drivers have reached speeds over 600 miles an hour.
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