harbinger

预兆、前兆、征兆正式

Falling leaves are often seen as a harbinger of winter.

落叶常被视为冬天将至的前兆。

先驱、先声正式

That small startup was the harbinger of a new industry.

那间小型新创公司是一个新产业的先驱。

预示、预告正式

The sudden silence harbingered trouble for the whole village.

突然的寂静预示著整个村庄将有麻烦。