(as) poor as a church mouse (或 as church mice)

extremely poor

一贫如洗，贫困潦倒

poor little rich boy (或 girl)

a wealthy young person whose money brings them no contentment (often used as an expression of mock sympathy)

[常用来表示含嘲弄语气的同情]可怜的小富哥（或妹）

the poor man's —

an inferior or cheaper substitute for the thing specified

较劣质的（或较便宜的）替代品

corduroy has always been the poor man's velvet.

灯芯绒一直是天鹅绒的便宜替代品。

poor relation

a person or thing that is considered inferior or subordinate to others of the same type or group

无名小卒，微不足道的人（或东西）

for many years radio has been the poor relation of the media.

多年来收音机一直是媒体中微不足道的一种形式。

take a poor view of

regard with disfavour or disapproval

不喜欢，看不起