老师将这篇论文中可疑的引用部分标记了出来。

The teacher ___red-flagged the questionable citations in the essay.

这个可疑的交易被银行系统自动标记为警告。

The suspicious transaction was automatically ___red-flagged by the bank's system.

这个可疑的包裹被标记为潜在危险物品。

The suspicious package was ___red-flagged as a potential hazard.