1.irreplaceable adj.不能调换的,不能代替的
例句:There's one man who's considered irreplaceable.
有一个人被认为独一无二。
2.select vt.选择; 挑选; 选拔
例句:When you tune a radio set, you select some particular station.
当你调收音机时,你选择某一特定电台。
3.retire vi.退休; 撤退; 后退
例句:He will retire from his job next year and take things easy.
他明年就要退休过轻松的生活了。