探赜索隐[tàn zé suǒ yǐn]
词典探赜索隐
词典delve into secret facts or principles：探赜索隐。
词典delve into the abstruse：探赜索隐。
词典unravel mysteries：探赜索隐。
delve into secret facts or principles; delve into the abstruse; unravel mysteries