Yabla Chinese

Yabla video uses of 考证
无从 wúcóng
考证 kǎozhèng
这 zhè
是 shì
一 yī
千年前 qiānniánqián
还是 háishì
两千年 liǎngqiānnián
前 qián
的 de
事 shì
With no historical record, it was something that [we believe] happened 1,000 to 2,000 years ago.