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| 两臂安全阻挡; 全面防守一; 安全阻挡 (法); 全面防守两臂阻挡 | |||
| 安全保护单元; 安全阻挡装置 | |||
| 保险块 | |||
| safety block: 3 phrases in 2 subjects |
| Drilling | 2 |
| Technology | 1 |
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