The look on her face was a definite sign that something was wrong.

一看她的神色就知道出事了。

《牛津词典》

Constantly checking your watch is perhaps the number one sign you're on the wrong bus.

不断地看表也许是最能说明上错车的迹象。

youdao

The first sign that the prediction was wrong came when 2008 turned out to be even calmer than expected.

显示这个预测错误的第一个迹象是，2008年表现得比预测中更为平静。

youdao

Perhaps all this confusion over trust--trusting the wrong people, distrusting the right ones--in the online world is just a sign of the Internets youth.

FORBES: The trust paradox

The participation of the inmates is a sign of their own reflection of their wrong-doing and I am certain it will lead to better decisions in the future.

FORBES: Crime Stories You Need to Know for 2011

Labour said the Tories' policy was widely regarded across Europe as "inept and wrong-headed" while the Lib Dems said the "unseemly row" was a sign of things to come if the Conservatives win the next election.

BBC: French minister bids to calm row