outer
adjective /ˈaʊtə(r)/
/ˈaʊtər/
[only before noun]- on the outside of something
外表的；外边的 - the outer layers of the skin
皮肤表层 - While the chassis is made of steel, the outer shell is plastic.
而底盘是钢制的，外壳是塑料的。 - The attackers began to enter through the outer walls.
攻击者开始从外墙进入。 - The stair winds up between the inner and outer walls of the house.
楼梯蜿蜒在房子的内墙和外墙之间。
- the outer layers of the skin
- furthest from the inside or centre of something
远离中心的；外围的 - I walked along the outer edge of the track.
我沿着跑道的外缘走。 - the outer suburbs of the city
城市的远郊 - Outer London/Mongolia
伦敦的外围地区；外蒙古 - (figurative) to explore the outer (= most extreme) limits of human experience
探索人类经验的极限
opposite inner - I walked along the outer edge of the track.
词源late Middle English: from out + -er, replacing earlier utter in its obsolete sense ‘outer’.