The SDP was the Social Democratic Party, a British party that no longer exists. It was formed in 1981 by several well-known Labour MPs who felt their old party had become too left-wing. They wanted a gentler, middle-ground kind of social democracy.

The SDP was the Social Democratic PartySDP指的是Social Democratic Party（社會民主黨）， a British party that no longer exists是一個已經不存在的英國政黨。 It was formed in 1981它是1981年成立的， by several well-known Labour MPs由幾位知名的工黨國會議員發起， who felt their old party had become too left-wing他們覺得自己原本的政黨變得太左派了。 They wanted a gentler, middle-ground kind of social democracy他們想要的是一種比較溫和、走中間路線的社會民主主義。

Dr David Owen is the leader people remember most. In the late 1980s most of its members joined with the Liberal Party to form the Social and Liberal Democrats, the party we now call the Liberal Democrats, or Lib Dems.

Dr David Owen is the leader people remember mostDr David Owen是大家最記得的那位領袖。 In the late 1980s most of its members joined with the Liberal Party1980年代後期，大部分成員跟自由黨合併， to form the Social and Liberal Democrats組成了Social and Liberal Democrats， the party we now call the Liberal Democrats, or Lib Dems也就是我們現在說的Liberal Democrats（自由民主黨），或Lib Dems。

So in a British history book, SDP is this 1980s breakaway — a short life, then a merger — not “social democratic party” as a type, and not a party in another country that happens to use the same three letters.

So in a British history book所以在英國歷史書裡， SDP is this 1980s breakaway — a short life, then a mergerSDP指的就是這個1980年代出走的黨——短命，然後合併—— not “social democratic party” as a type不是泛指「社會民主黨」這種類型， and not a party in another country that happens to use the same three letters也不是剛好用同樣三個字母的其他國家政黨。