It was found on analysis to contain traces of soda.

经分析发现它含少量的苏打。

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The water was found to contain traces of sulphuric acid.

水里发现含有微量硫酸。

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The cake on analysis was found to contain traces of toxin.

经分析发现蛋糕里含有微量的毒素。

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Although none tested positive for horse DNA, some own-brand meatballs were found to contain traces of pork.

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The evidence had come from scientists analysing strands of the child's hair that were found to contain traces of the drug.

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The FSAI tested 27 beef burgers and of that sample, 37% tested positive for traces of horse DNA, while 85% were found to contain traces of pig DNA. The amounts detected were very small, except for one beef burger from Tesco, that was found to contain 29% horsemeat.

BBC: Burgers