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| 双黉管一种乐器; 欧巴; 风琴的欧巴音程 | |||
| 双簧管 | |||
| 阿波耶系统 | |||
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| "欧波"雷达领航和仪表轰炸系统 | |||
| English thesaurus | |||
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| ob | |||
| observer bomber over enemy | |||
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| observed bombing observer bomber of enemy | |||
| offshore buoy observing equipment | |||
| operational buoys for ocean environment | |||
| observed bombing of enemy | |||
| oboe: 1 phrase in 1 subject |
| Air defense | 1 |