☉ 万事俱备，只欠东风 【wànshìjùbèizhǐqiàndōnɡfēnɡ】
　　[ everything is ready,and all that we need is an east wind；all is ready except what is crucial ] 指三国时周瑜火攻曹营，一切都准备就绪，只欠东风尚未刮起，不能放火。比喻办事的其它条件均已成熟，唯一还少一条就能成功。