欠了解（Insufficiently Known）(K)：怀疑但由于缺乏资料不能确切地归入以上任一等级的类群。
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... Instantaneous speciation 瞬时成种 Insufficiently Known 情况不明 Insular speciation 岛屿成种 ...
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Insufficiently Known-K 久了解
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This is for example the case of herbal medicine which power is generally underestimated and insufficiently known, or of practices that are exclusively turned to without consideration of their limitations.
UNESCO: Social and Human Sciences
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