Apparently, the weather in Yosemite can change without warning.

显然，约塞米蒂的天气会毫无预警地变化。

Natural disasters occur without warning.

自然灾害在没有预警的情况下发生。

An avalanche can occur without warning in the mountains.

在山里，雪崩可能会毫无预警地发生。

The bloodthirsty pirates attacked the ship without warning.

嗜血的海盗毫无预警地袭击了这艘船。

She experiences sporadic headaches that come and go without warning.

她经历了偶发的头痛，来去无常。

The weather in this region is capricious and changes without warning.

这个地区的天气反复无常，变化无常。

In some places, fast currents(急流)can sweep swimmers away without warning.

在一些地方，急流可以毫无预警地将游泳者卷走。

In some places, fast currents (急流) can sweep swimmers away without warning.

在某些地方，急流可以毫无征兆地将游泳者卷走。

The bombs fell completely without warning.

炸弹毫无征兆地完全落下。

You stopped without warning !

你没有提醒一下就停车！