going by train is more economical than going by plane.
坐火车比坐飞机更节约。
helen prefers going by train to flying.
海伦宁愿乘火车而不愿乘飞机。
going by train doesn't cost as much as by plane, and going by bus is not a.
搭火车的费用没有搭飞机的高,搭公车不如搭火车舒适。
are you going by train or by bus?
你坐火车还是坐汽车?
she prefers going by train rather than going by air.
她宁肯乘火车,也不愿坐飞机去。