start from scratch 白手起家; 从头开始

今天和大家分享的是：

start from scratch 白手起家; 从头开始
A: Where's the report you were supposed to finish?
B: It isn't finished. My computer crashed and I'llhave to
start from scratch.
(A: 你该做完的报告弄到哪里去了？)
(B: 还没写完。我的计算机当机，因此我得从头再来一遍。)