replacement cushion
| method
| replacement cushion | |
| tech. | 换土垫层 |
| method | |
| gen. | 法; 标准; 水平 |
| environ. | 方法 |
| hydroel.st. од. | 方法 |
| mech. | 电火花法 |
| |||
| 换土垫层 | |||
|
replacement cushion : 2 phrases in 1 subject |
| Technology | 2 |