我们同悲同喜已成了默契我们同出同入已成了习惯
[wŏ men tóng bēi tóng xĭ yĭ chéng le mò qì wŏ men tóng chū tóng rù yĭ chéng le xí guàn]
Expressing deep emotional ties and companionship. This indicates two individuals share similar joys and sorrows as if it's a tacit agreement and routine to appear together in public.