piston compression
| ring
| piston compression | |
| space | 活塞压缩 |
| ring | |
| gen. | 戒指 |
| auto.ctrl. | 环状单元 |
| econ. | 瑞恩 |
| hydroel.st. од. | 环 |
| interntl.trade. | 交易场; 垄断集团 |
| |||
| 活塞压缩 | |||
|
piston compression : 5 phrases in 2 subjects |
| Automobiles | 2 |
| Technology | 3 |