废寝忘食

wǒ fèi qǐn wàng shí de gōng zuò

我废寝忘食地工作。

I forget to eat and sleep while working.

yǒu shí tā shèn zhì fèi qǐn wàng shí yī zhí gōng zuò dào shēn yè

有时她甚至废寝忘食，一直工作到深夜。

Sometimes she even forgets to eat and rest and works until late night.

tā gōng zuò dào le fèi qǐn wàng shí de dì bù

他工作到了废寝忘食的地步。

He lost himself in the work and forgot about the time.