There are serious risks that laboratories may foul up these tests.实验室很有可能搞砸这些试验。Why do some people foul up and become criminals?为什么有些人会走上歧途变成罪犯 呢 ?Nothing could foul up their militant spirit.什么也不能挫伤他们的斗志....

foul up的音标：foul up的英式发音音标为：[faul ʌp]foul up的美式发音音标为：[faʊl ʌp]...

弄脏，弄糟，犯错，缠住...