例句：

　　By way of introduction , let me give you the background to the story.

　　作為引言，我先來(lái)介紹一下故事的背景。

　　The camera has undergone only two minor tweaks since its introduction.

　　這款相機(jī)自推出以來(lái)只經(jīng)過(guò)兩次小的改進(jìn)。

　　Millions of words have been written about the introduction of the euro.

　　已有上百萬(wàn)的文字論及歐元的引入。

　　Introduction of electronic point-of-sale systems is improving efficiency.

　　電子售貨系統(tǒng)的引進(jìn)提高了工作效率。

　　A prolonged drought had necessitated the introduction of water rationing.

　　一場(chǎng)持續(xù)的干旱使定量供水的引進(jìn)成為必需。