expression · a figurative expression used when one person or thing is just as bad as the other; two of a kind

这两台电脑的运行速度都很慢，真是难兄难弟。

expression · hard to differentiate between two people or things because they are so similar in quality, talent, or status (originally referring to elder and younger brothers)

这两位杰出人才的成就难分高下，真是难兄难弟。

expression · People who share the same misfortune or are experiencing the same difficult circumstances together.

在这场经济危机中，他们这些失业的人成了难兄难弟。