《单一欧洲法案》的主要条款是什么？英文作答。

Apart from minor modifications, this Treaty was the first profound and wide-ranging constitutional reform of the EU since the 1950s. The SEA introduced measures aimed at achieving an internal market (for instance, harmonisation) plus institutional changes related to these (such as a generalisation of qualified majority voting and a cooperation procedure involving the European Parliament). It also provided legal form for European Political Cooperation (EPC). The SEA was signed in February 1986 and came into force on 1 July 1987.

参见http://www.unizar.es/euroconstitucion/Treaties/Treaty_SingleEA.htm