People at the time thought that acid rain was a harbinger of the destruction of the world.

当时的人们以为酸雨是世界毁灭的前兆。

The attack was a harbinger of violence.

这场袭击是暴乱的先兆。

I saw a crow as soon as I went out, which was not a good harbinger of the future

我一出门就看到了乌鸦，这可不是个好征兆。

GM's demise should not be read as a harbinger of doom for the car industry.

通用的破产不应该被认为是汽车行业衰败的前兆

The November air stung my cheeks, a harbinger of winter.

11月的空气刺痛了我的脸颊，这是冬天要来的先兆。

That blunt text message may be a harbinger of things to come.

那条直白的短信可能是未来的预兆。

Harbinger of a new day.

带来了崭新的一天。

Harbinger, perhaps, of a new battle plan.

或许，这预示着会有新的战斗计划。

A harbinger, perhaps, of the trouble ahead.

也许，这预示着麻烦即将降临。