一级的英文：
stair

• "Step by step, the ladder is ascended"
  梯子是一级级爬上去的
• Primary underwriters of government securities.
  国债一级自营商
• She was awarded a first-class degree in English.
  她获得一级优等英语学位。
• He decided to appeal to a higher court.
  他决定向上一级法院上诉。
• Screening and sedimentation are the two types of primary treatment used for textile wastes
  筛滤和沉淀是用于纺织废水的两种一级处理方法。
• In this treatise, we emphasize first-order splines
  在这一处理中，我们强调一级样条。
• Wang is not. A magnetic resonance imaging exam on his right leg revealed a Grade1 hamstring pull Saturday morning.
  王建民不是。星期六早上的核磁共振检查后显示他的右小腿肌腱是一级拉伤。
• The lubricant specialist Castrol is the new technical sponsor of the Williams Renault Formula One team.
  润滑油专业制造商嘉实多将是威廉姆斯·雷诺特一级方程式车队的新技术赞助商。
• Well, we send all the first-class mail by plane to the East Coast, so you don't need an airmail stamp.
  是这样，我们寄到东海岸的一级邮件全部用飞机传递，所以你不需要贴航空邮票。
• Hakkinen of Finland had his first test in the 1996 Mclaren Formula One Car at the Estoril track in Portugal 0n Thursday.
  星期四,芬兰车手哈基宁在葡萄牙埃斯图里尔车道进行他的1996年麦克拉伦一级方程式赛车首次试车练习。

• She has trouble navigating the stair.
  她上下台阶有困难。
• They went clumping up the stairs.
  他们拖着沉重的脚步走上楼。
• She pegged down the stairs.
  她急忙下楼。
• There was a woman mopping the stairs.
  一个女人在拖楼梯。
• She was standing at the top of the stairs.
  她站在楼梯的顶端。