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| 歌剧; opus 的复数乐曲; 著作; 作品 | |||
| 歌剧院 | |||
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| 娥佩兰 | |||
| Opera 浏览器 | |||
| English thesaurus | |||
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| o | |||
| A powerful type of drama, where a majority of the words are solely sung. | |||
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| oil pollution environmental risk assessment | |||
| operational analysis | |||
| Open Process Engine For Reliable Activities | |||
| operational analysis | |||
| out-of-pile expulsion and reentry apparatus | |||
| opera: 74 phrases in 11 subjects |
| Advertising | 1 |
| Automobiles | 4 |
| Bridge construction | 1 |
| China | 1 |
| Cosmetics and cosmetology | 1 |
| Exhibitions | 3 |
| General | 7 |
| Industry | 2 |
| Librarianship | 1 |
| Technology | 6 |
| Textile industry | 47 |