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| 大〔主〕发条; 主簧; 主钢板弹簧; 主要动力; 主要动机〔动力，原因〕; 主泉; 枪的击针簧 | |||
| 主要起因; 主要动机 | |||
| 击发簧; 击锤簧; 主弹簧 | |||
| 主〔钟表〕 弹簧 | |||
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mainspring : 8 phrases in 1 subject |
| Technology | 8 |
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