The book is an expansion of a series of lectures given last year.

　　本書是去年舉行的系列講座的擴(kuò)充。

　　Despite the recession the company is confident of further expansion.

　　盡管經(jīng)濟(jì)衰退，公司對進(jìn)一步擴(kuò)展仍充滿信心。

　　The memory expansion cards are useful adjuncts to the computer.

　　內(nèi)存擴(kuò)充卡是計算機(jī)很有用的附件。

　　The company intends a slow-down in expansion.

　　公司準(zhǔn)備放慢擴(kuò)展速度。

　　One of the driving forces behind this recent expansion is the growth of services.

　　最近的這次經(jīng)濟(jì)擴(kuò)張背后的主要推動力量之一是服務(wù)業(yè)的增長。