U-1:under one's own steam 独立
A:Did you finish your homework under your own steam?
A:你是独立完成的作业吗?
B:Yeah.
B:是的。
A:Then how was it you failed the exam? They were the same questions, you know.
A:可为什么你考试不及格?你该知道,题目都是一样的呀!