不入虎穴,焉得虎子不深入到老虎的洞穴中就得不到老虎崽子。指不敢于冒险、不经历艰难险阻就不会取得成就。英The only way to catch tiger cubs is to go into the tiger's den; nothing venture,nothing gain;
龙潭虎穴藏龙深潭卧虎洞穴。喻极其危险的处所。例卢俊义撇却锦簇珠围来试龙潭虎穴。——《水浒传》英dangerous spot as a dragon's pool and tiger's den——a danger spot;