| 单词 | of an unknown nature |
| 例句 | DEFINITIVE EXAMPLES 权威例句〔unidentified flying object〕A flying or apparently flying object of an unknown nature, especially one suspected to have been sent by extraterrestrial beings.不明飞行物：一个未知性质的飞行或似在飞行的物体，尤指被怀疑由外星人派来的美国传统 |
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