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useful space
| principle
| useful space | |
| tech. | 有效空间 |
| principle | |
| gen. | 主义 |
| bridg.constr. | 规律 |
| hydroel.st. | 法则; 定律; 因素; 本质 |
| met. | 要素 |
| tech. | 原理; 原则 |
| |||
| 有效空间 | |||
|
useful space principle : 1 phrase in 1 subject |
| Bridge card game | 1 |
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