六级Because their behaviors are not usually seen as a red flag, these young people have been dubbed the invisible risk group by the study's authors.
由于他们的行为通常不被视为危险信号，研究作者将这些年轻人称为无形风险群体。
2016年12月阅读原文
四级When you forget entire experiences, he says, that's "a red flag that something more serious may be involved."
他说，当你忘记了所有的经历时，“这是一个危险信号，表明可能涉及到更严重的事情。”
2018年6月四级真题（第二套）阅读 Section C
四级Some hired flag wavers to direct customers to empty parking spaces.
一些人雇佣了摇旗手，将顾客引导到空停车位。
2008年12月英语四级考试真题
四级When you forget entire experiences, he says, that's "a red flag that something more serious may be involved. "
他说，当你忘记整个经历时，这是“一个危险信号，表明可能会涉及更严重的事情。”
2018年6月大学英语四级真题（第1套)
考研The well-known Olympic flag, however, is a modern conception: the five interlocking rings symbolize the uniting of all five continents participating in the Games.
然而，众所周知的奥运会旗是一个现代概念：五个环环相扣的圆环象征着参加奥运会的五大洲的团结。
1987年全国硕士研究生入学统一考试英语试题
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