参考译文

food idioms 07
趣味食品idioms 07 [下午茶－趣味食品习语]

gravy train
MEANING: a job or work that pays more than it is worth
For many years his job was a real gravy train but now the company has become very strict and will not pay overtime.

half-baked
MEANING: not thought out or studied carefully
He has a half-baked idea about starting a new business but most of us think that it will fail.

hard nut to crack
MEANING: something or someone difficult to understand or do
He is a very serious person and is a very hard nut to crack.

have egg on one's face
MEANING: be embarrassed
He has egg on his face because everyone knows that he was sick at the party.