The book is an expansion of a series of lectures given last year.
本书是去年举行的.系列讲座的扩充。
Despite the recession the company is confident of further expansion.
尽管经济衰退，公司对进一步扩展仍充满信心。
The memory expansion cards are useful adjuncts to the computer.
内存扩充卡是计算机很有用的附件。
The company intends a slow-down in expansion.
公司准备放慢扩展速度。
One of the driving forces behind this recent expansion is the growth of services.
最近的这次经济扩张背后的主要推动力量之一是服务业的增长。