梦想很丰满现实太骨感
[mèng xiăng hĕn fēng măn xiàn shí tài gú găn]
'Dreams are bountiful whereas reality too bony' refers to vast contrast between ambitious aspirations (which usually are vivid, full, and colorful), and real-life conditions which are quite the opposite and far poorer, simpler, and harder compared to our dreams