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

　　這是對(duì)一門(mén)極為復(fù)雜的學(xué)科的有益入門(mén)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(xiàn)代爵士樂(lè)。

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

　　這屆政府的垮臺(tái)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(tái)也使系統(tǒng)的效率有所降低。

　　Michael Jackson, of course, needs no introduction.

　　邁克爾·杰克遜，當(dāng)然，眾所周知。