Moon Express is not the only company seeking for the right to travel to outer space.
2018年6月四级真题(第一套)听力 Section A
英语六级真题
The outer layers of the volcano were worn away until the hard core stood completely exposed.
出自-2016年12月听力原文
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月六级真题(第三套)阅读 Section C
柯林斯高阶英汉双解学习词典释义
ADJ
外面的;外部的;远离中心的
The outer parts of something are the parts which contain or enclose the other parts, and which are furthest from the centre.