fourth-order
| sequence
| fourth order | |
| auto. | 第四 行程 |
| sequence | |
| gen. | 先后; 序 |
| geol. | 时序 |
| geol. од. | 层序 |
| hydroel.st. | 顺序; 次序 |
| hydroel.st. од. | 序列 |
| met. | 系统 |
| oil | 沉积剖面 |
| sport. | 连续 |
| |||
| 发动机第四排气行程 | |||
| 四等 | |||
|
fourth-order : 18 phrases in 11 subjects |
| Automobiles | 2 |
| Aviation | 1 |
| Desert science | 1 |
| Electric machinery | 1 |
| Electronics | 1 |
| Hydroelectric power stations | 2 |
| Metallurgy | 1 |
| Oil / petroleum | 2 |
| Public security | 1 |
| Space | 1 |
| Technology | 5 |