unpredictable ; without warning ; without a sign ; out of the blue
身体，毫无征兆的倒下。
Body has no falling flop of portent.
youdao
但是经常性的一个虫群会在毫无征兆的情况下改变前进方向。
But often a swarm changes direction without warning.
缘分让爱情变成可能。爱情事一场毫无征兆的邂逅。
The fate let love become possible. Love what a encounter without warning.
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