水滴石穿constant perseverance yields success (lit. dripping water penetrates the stone)

水土不服unaccustomed to a place;not acclimatized

死灰复燃resurgence;revival (lit. ashes burn once more)

四面楚歌be besieged on all sides and without help (lit. on all sides;the songs of Chu)

似是而非appeared right but actually was wrong

四通八达extend in all directions;connected to all parts of the world

肆无忌惮absolutely unrestrained;unbridled;without the slightest scruple

私心窃喜secretly happy 私心=selfish and self-indulgent;窃= surreptitiously;喜=happy;celebratory

叹为观止acclaim sth. as the acme of perfection;to gasp in amazement

谈笑自若go on talking and laughing as if nothing had happened;be cheerful and composed (in face of danger)