bear witness (to something) idiom
见证了（…）；证明了（…）
If something bears witness to a fact, it proves that it is true.
The numerous awards on the walls bear witness to his great success. 墙上数不清的奖状证明了他的巨大成功。
As last week's riots bear witness, the political situation is very unstable. 上周的暴乱证明了政治局势非常不稳定。