重点讲解：
1. due to
由于；因为；
eg. Great changes are in prospect in this area due to foreign investment.
因为外资的引进，该地区会发生很大变化。
eg. His success is entirely due to hard work.
他的成功完全是努力工作的结果。
2. a lack of
缺乏；不足；没有；
eg. There is a lack of people wanting to start up new businesses.
有创业意愿的人非常匮乏。
eg. The main impediment to growth was a lack of capital.
影响发展的主要障碍是缺乏资本。
3. lag behind
落后；赶不上；
eg. The thinking of economic bureaucrats tends to lag behind changes in world conditions.
经济官员的思想往往跟不上世界局势的变化。
eg. Rent tends to lag behind housing prices.
租金价格走势通常落后于楼价。
