重点讲解：
1. put together
装配；组装；拼合；组合；
eg. He took it apart brick by brick, and put it back together again...
他一块砖一块砖地把它拆开，然后又把它组合起来-VU9uS;G,nPvCH。
eg. The factories no longer relied upon a mechanic to put together looms within the plant.
工厂不再依靠机修工在车间里组装织机q_*|k~P*mwiyGS0467J。
2. from scratch
从零开始；从头做起；白手起家；
eg. Building a home from scratch can be both exciting and challenging.
建立一个全新的家庭既让人兴奋又富于挑战JERTiS);oM+Tvbw.。
eg. Hong Kong's manufacturing industry did not start from scratch in the post-war period.
战后，香港制造业的兴起并非从零开始SQqchEzeeuaQWeV1+@。
3. fall into
属于；被划分为；
eg. The problems generally fall into two categories.
问题大致分成两类LjkAcVW06+a9e0UO-k。
eg. Both women fall into the highest-risk group.
两个女人都属于高危人群Z]Ehw%7,;@+I。