前缀at-同ad-. 词根test, 见证，来自PIE *tri-st, *tri同three, 三。st,站。即第三者，见证者，词源同testis, 睾丸，testament，证词。单词test, 测试，同词根terra, 土，见terrestrial, 领土的。原指土制陶罐用来检测贵金属如金，银纯度。字母r,s音变。

1. I can personally attest that the cold and flu season is here.

感冒和流感季节来了，对此我有切身体会。

2. Police records attest to his long history of violence.

警方记录证明他有长期从事暴力活动的前科。

3. Contemporary accounts attest to his courage and determination.

当时的报道证实了他的勇气和决心。

4. I can attest to the absolute truth of his statement.

我可以证实他的话是千真万确的.

5. These ruins sufficiently attest the former grandeur of the place.

这些遗迹充分证明此处昔日的宏伟.