孤掌难鸣

It's hard to clap with only one hand. / It takes two to tango / It's difficult to achieve anything without support.

lone / lonely

palm of the hand / sole of the foot / paw / horseshoe / to slap / to hold in one's hand / to wield

difficult (to...) / problem / difficulty / difficult / not good

disaster / distress / to scold

to cry (of birds, animals and insects) / to make a sound / to voice (one's gratitude, grievance etc)