三心二意

jì rán jué dìng le jiù bié sān xīn èr yì

既然决定了，就别三心二意。

There should be no more shilly-shallying once the decision was made.

tā zuò shì zǒng shì sān xīn èr yì

她做事总是三心二意。

She is always of two minds.

wǒ zuò shì cóng lái bù huì sān xīn èr yì

我做事从来不会三心二意。

I'm not a person of two minds.

sān xīn èr yì shì bù xíng de yào me jiù quán lì yǐ fù yào me jiù shén me dōu bù gàn

三心二意是不行的，要么就全力以赴，要么就什么都不干。

Half-heartedness won't do. It's got to be all or nothing.