He patched up an old bicycle to ride to work and save carfare.他修补了一辆旧自行车,骑车上工,省下了交通费.That guy's always trying to put the bite on me for carfare home.那家伙每次回家都找我借钱付汽车费....
肺细胞约每周新老更替一次。Lung cells die and are replaced about once a week.昼夜更替.Day and night alternate.从事高等教育的人员新老更替极其缓慢。There has been very little renewal of personnel in higher education....