These things also happen in good weather and without warning. Ships just seem to vanish into thin air.

而且，这些事情恰巧都发生在好天气里，更没有任何先兆，那些船只就像是消失在了空气中。

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Sometimes it gets even worse, when one partner meets someone new and ends the long-term alliance suddenly and without warning.

更糟的是，有时候当其中一个成员遇到一个新的人的长期联盟突然结束，而且没有警告。

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As grains build up, the pile grows in a predictable way until, suddenly and without warning, it hits a critical point and collapses.

当沙砾慢慢增加，沙堆一直在预料的方式中成长，直至突然而又毫无警戒地，它到达了一个临界点然后崩塌了。

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But sometimes the reality is that defining moments of history come suddenly and without warning.

BBC: In full: Brown's speech to Congress

He told The Wall Street Journal in a telephone interview that the blast happened quickly and without warning.

WSJ: Guides Recall Escape From Philippine Volcano

He told The Wall Street Journalthat the blast happened quickly and without warning.

WSJ: Guides Recall Escape From Philippine Volcano