Human indignation evolved from an uncertain source.

人类愤恨的情感来源不明。

youdao

Scientists believe water activity affected this plateau after the formation of the nearby canyons. Although the source of water and sediment remains uncertain.

科学家相信，在附近峡谷形成之前这片高原受到过水的影响，虽然水源和泥沙的问题仍不明朗。

youdao

This is the source of our confidence: the knowledge that God calls on us to shape an uncertain destiny.

这就是我们信心的源泉——响应上帝号召，去把握无常的命运。

youdao

The reports released this week allege often citing a single source or uncertain information that the ISI helped train Afghan suicide bombers, plotted to poison beer slated for GIs, and schemed to assassinate President Hamid Karzai.

WSJ: The AfPak Papers

BBC's source was uncertain.

ECONOMIST: Politics

It is uncertain when the Nordic lands first became a source of trendiness.

NEWYORKER: Aska