Moon Express is not the only company seeking for the right to travel to outer space.
2018年6月四級真題（第一套）聽力 Section A
英語六級真題
The outer layers of the volcano were worn away until the hard core stood completely exposed.
出自-2016年12月聽力原文
Some fish, too, have had limited success vacationing at the lake as less salty lagoons form on the outer edges from hot springs flowing into Lake Natron.
2017年12月六級真題（第三套）閱讀 Section C
柯林斯高階英漢雙解學習詞典釋義
ADJ
外面的；外部的；遠離中心的
The outer parts of something are the parts which contain or enclose the other parts, and which are furthest from the centre.