standard gauge
standard-gauge的词性:n.(名词)
1. A railroad track having a width of 56? inches (143.5 centimeters).标准轨距:宽度为56.5英寸的轨距(143.5厘米)
2. A railroad or railroad car built to standard gauge specification.标准轨距铁路(或机车):根据标准轨距造的铁路或列车