first row第一排firstadj.第一的；最初的adv.首先；第一n.最初；(序数词)第一First-aid medical急救医疗first tempering bin头次调湿仓first breaking pole首开相first approximation一级近似,首次近似,初步近似,第一次近似,一次近似值,第一近似first-calf heifer头胎的first signal system第一信号系统First-aid nursing急救护理first derived curve一阶导曲线first-class cabin头等舱first arch syndrome第一鳃弓综合征:巨口, 半下颌及外耳畸形

1. The first grade was allowed to leave school early.
   一年级学生被允许提早离校。
2. I am in my first year at college.
   我今年上大学一年级。