As opportunities and threats appear at unpredictable times, event-driven systems must respond to events at times that are externally determined.

当机会和威胁在不可预测的时间出现时，事件驱动的系统必须在外部确定的时间响应事件。

youdao

Shortly after this first successful event, unpredictable global economic conditions led to the cancellation of the AoT general meeting.

在这次首届活动成功举办之后不久，难以预测的全球经济环境导致 AoT 大会取消。

youdao

What I call a "Black Swan" is an exceptional unpredictable event that, unlike the bird, carries a huge impact.

FORBES

The problem for baseball over the long term is that the strikeout is the one offensive event that hardly ever sets into motion an unpredictable result.

WSJ: Baseball 2013: Here Come the Flamethrowers