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| 密封头盔观察窗 | |||
| 头盔观察窗 | |||
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| 头盔护目镜 | |||
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helmet visor : 7 phrases in 5 subjects |
| Automobiles | 1 |
| Aviation | 2 |
| Electronics | 1 |
| Textile industry | 1 |
| United Nations | 2 |
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