[tàn tāng dǎo huǒ]   

探    汤    蹈    火    犹言赴汤蹈火。比喻不怕任何艰险。

比喻不怕任何艰险。

Go into boiling water and walk through fire and water

探头探脑    探本穷源    探囊取物    探赜索隐    探骊得珠