包藏祸心

tā men de jiàn yì bù jǐn yī wén bù zhí ér qiě bāo cáng huò xīn

他们的建议不仅一文不值，而且包藏祸心。

Their proposals are all worthless and designed out of sinister motives.

tā de zhèng dí duì tā jìn xíng le bāo cáng huò xīn de gōng jī

他的政敌对他进行了包藏祸心的攻击。

His political opponents made a calculated attack on him.