undocumented
形容词 C1中文： 无证件的、无文献记载的
- Lacking instructions or reference material. · Undocumented software can be very difficult to learn to use.
- Not having official documents that provide identification, authorization, etc.
- Not having official documentation required to legally enter, reside in, or work in a country. · undocumented immigrant
来自图书馆
As they traversed the sweeping expanses of the Great Plains and the formidable elevations of the Rocky Mountains, they painstakingly recorded hundreds of previously undocumented species.
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