bellwether

1. N-COUNT If you describe something as a bellwether, you mean that it is an indication of the way a situation is changing. 征兆; 風向標[美國英語] [journalism] [usu sing, oft N n]

The Methodist church is viewed as a bellwether of U.S. attitudes in large part. 衛(wèi)理公會派教堂在很大程度上被認為是美國立場的風向標。

IBM is considered the bellwether stock on Wall Street. IBM的股票行情被認為是華爾街股市的風向標。