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。

　　This album was my first introduction to modern jazz.

　　這張專輯唱片讓我初次接觸了現代爵士樂。

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

　　這本書列出了適合英國花園種植的花草，其中有很多新引進的品種。

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

　　這屆政府的垮臺在很大程度上歸因于征收一種新稅。

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

　　新刑事訴訟法的出臺也使系統的效率有所降低。