重点讲解：
1. from scratch
从零开始；从头做起；白手起家；
eg. He lost all his money and had to start again completely from scratch.
他损失了所有的钱，只好再从头做起。
eg. One can hardly believe that this paper mill was started from scratch only a few years ago.
很难相信这个造纸厂仅仅是在几年前白手起家办起来的。
eg. There were so many spelling mistakes, I had to write the letter out again from scratch.
这封信的拼写错误太多，我得重写一遍。
2. would-be
adj. 想要成为…的；
eg. Follow after truth if you would be a man.
做一个男子汉就要追求真理。
eg. He said I would be a lawyer and it has come true.
他说我会成为一名律师，现在已经实现了。