introduction是可数名词吗吗

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

这是对一门极为复杂的学科的有益入门教程。

This album was my first introduction to modern jazz.

这张专辑唱片让我初次接触了现代爵士乐。

The book lists plants suitable for the British flower garden, among them many new introductions.

这本书列出了适合英国花园种植的`花草，其中有很多新引进的品种。

The introduction of a new tax accounted in no small measure for the downfall of the government.

这届政府的垮台在很大程度上归因于征收一种新税。

The introduction of a new code of criminal procedure has also slowed up the system.

新刑事诉讼法的出台也使系统的效率有所降低。