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| 复土机 | |||
| 填坑机 | |||
| 回填机; 回注管; 填沟机 | |||
| 回土机; 回填物; 充填器; 覆土机; 填土机; 填土工 | |||
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backfiller : 15 phrases in 3 subjects |
| Architecture | 2 |
| Oil / petroleum | 3 |
| Technology | 10 |
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