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| 定期维护 | |||
| 经常养护 | |||
| 经常维护 | |||
| 经常维修; 经常保养; 定期维修 | |||
| 日常维修; 经常性养护 | |||
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constant maintenance : 2 phrases in 2 subjects |
| Chemistry | 1 |
| Technology | 1 |
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