extra- /ˈɛkstrə-/

• 1. 

  PREFIX extra- is used to form adjectives indicating that something is outside something or is not part of it. 表示“在...外的” [正式]

  例：

  The move was extra-constitutional.

  此举在宪法的规定范围之外。

  例：

  The report says torture was widespread, as were extra-judicial executions by government troops.

  报告称滥用刑法非常普遍，政府军队将其作为司法程序之外的判决。

  例：

  The planet is one of 119 known extra-solar planets, objects that orbit stars other than the sun.

  这是119颗太阳系外行星中的一颗。这些行星围绕除太阳外的其他星体运行。