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

　　本書(shū)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(duì)進(jìn)一步擴(kuò)展仍充滿(mǎn)信心。

　　The memory expansion cards are useful adjuncts to the computer.

　　內(nèi)存擴(kuò)充卡是計(jì)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(dòng)力量之一是服務(wù)業(yè)的增長(zhǎng)。