Unverifiable due to insufficient data or lack of conclusive evidence; unable to be substantiated.
他提出的理论虽然听起来很有趣，但因缺乏实验数据支持，恐怕只是杞宋无征。
Although the theory he proposed sounds very interesting, it is likely unverifiable due to the lack of experimental data to support it.
Era:
Ancient
Frequency:
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