■one by one 一个个地 He went through the items on a list one by one. 他逐个处理单子上的项目。http://yingyu.chazidian.com Students went out of the classroom one by one as soon as the bell rang. 下课铃一响，学生们一个个从教室里走出来。 ■in one 合为一体 He’s President, Treasurer and Secretary in one. 他身兼会长、司库和秘书三职。 It's a book of English phonetics，grammar and usage in one. 这是一本英语语音、语法和习惯用语结合为一体的书。 ■one too many 多余的，不需要的 I found myself one too many among them. 我发现自己在他们当中是个多余的人。 ■one in a thousand 优秀的人（或事物） My brother is a one in a thousand. 我的兄弟是位优秀人物。