| 71. | the farthest bounds of the ocean |
| 大洋最远的边缘
|
| 72. | the exploration of the ocean depth |
| 海深之探测
|
| 73. | a ridge on an ocean bottom |
| 海脊
|
| 74. | an ocean lane |
| 外洋航线
|
| 75. | launch on an ocean voyage |
| 开始远洋航行
|
| 76. | a big ocean liner |
| 大型远洋客轮
|
| 77. | the ocean tram erased by several steamer lines |
| 由好几条轮船航线纵贯的大洋
|
| 78. | ocean [offshore] navigation |
| 远洋[近海]航行
|
| 79. | an ocean passage |
| 远洋航行
|
| 80. | the perils of the ocean |
| 海洋上的危险（如暴风雨、海滩等）
|