重点讲解：
1. use as
用作为；把…当作…使用；
eg. The company has decided to use Belfast as its distribution base.
公司决定把贝尔法斯特作为销售基地。
eg. Many people use education as a stepping-stone to a better life.
许多人将教育作为赢得更好的生活的手段。
2. in preparation for
为……作准备；
eg. They've sold their house and car in preparation for leaving the country.
他们卖掉了房子和汽车准备出国。
eg. He packed his bags in preparation for the journey.
他打好提包，为旅行作准备。
3. grow into
成长为；发展为；
eg. The boys grew into men.
这些男孩子长成了男子汉。
eg. This political row threatens to grow into a full blown crisis.
这场政治争端有可能演化成一场全面爆发的危机。