introduction可數嗎

　　雙語例句

　　1.It's a useful introduction to an extremely complex subject.

　　這是對一門極為復雜的學科的有益入門教程。

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

　　引進銷售點電子系統提高了效率。

　　3.On balance, the book is a friendly, down-to-earth introduction to physics.

　　總而言之，這是一本通俗而務實的物理入門書。

　　4.A prolonged drought had necessitated the introduction of water rationing

　　由于持續干旱，用水需要實行配給了。

　　5.He explains in the introduction how he gathered the data.

　　他在引言里解釋了他是如何收集到數據的。