ㄉㄨˊㄇㄨˋㄅㄨˋㄔㄥˊchéngㄌㄧㄣˊlín

  1. 比喻力量單薄無法成事·》:不成獨木不成林一個終久不好看。」獨木不林」、獨樹不成林」。

a lone tree does not make a forest (idiom)​, one cannot accomplish much on one's own