The signature was attested by two witnesses.

这个签名有两名见证人。

《牛津词典》

The man's ability was attested by his rapid promotion.

此人的能力由他升迁之快得到证实。

youdao

His popularity is attested by the fact that more than a score of his books remain in print, and translations are still read around the world.

他的作品中有二十几部至今仍在印行，其外文译本仍在世界各地拥有读者，由此可见他的享誉程度。

youdao

Feasting, particularly on pork, is attested by excavated remains of animal bones.

BBC: Discovering Britain��s prehistoric stone circles

It was President Bush's seminal insight the wisdom of which I would say is attested by the fact that it looks so obvious in retrospect.

CENTERFORSECURITYPOLICY: Remarks to the Council on Foreign Relations

When they fail, the maliks must produce the culprit, his guilt attested by a tribal jirga, or council, for punishment by the PA (until recently up to 14 years in prison with no appeal).

ECONOMIST: Waziristan