| 11. | We saw the birth of space travel when the first astronauts were sent to outer space. |
| 随着首批宇航员被送往外层空间，人类开始了太空旅行的时代。
|
| 12. | The insulation of the outer walls helps keep our house warm in the winter. |
| 外墙的绝热有助于冬天室内保温。
|
| 13. | peel away the outer layer |
| 剥掉外层
|
| 14. | the outer layer of wallpaper |
| 壁纸的外层
|
| 15. | outer garments |
| 外衣
|
| 16. | the outer walls of a house |
| 房子的外墙
|
| 17. | the outer hall |
| 外厅
|
| 18. | the outer suburbs of the city |
| 城市的远郊
|
| 19. | the exploration of outer space |
| 对外层空间的探索
|
| 20. | the inner [middle, outer ] ear |
| (解）内[中、外]耳
|