空前絕后unprecedented and never to be duplicated;the first and the last;unmatched;unique
口是心非saying something that one does not mean (lit. mouth says yes;heart no)
口說無憑oral expressions can not be taken as evidence;words of mouth alone don’t carry conviction
苦盡甘來bitterness finishes;sweetness begins;the hard times are over;the good times just beginning
濫竽充數(shù)fill a position just to make up the number (lit. to play the yú 竽 mouth organ to make up numbers)
狼狽為奸villains collude together;to work hand in glove with sb.
狼吞虎咽to eat very quickly and ravenously
老馬識途an old hand is a good guide;an experienced worker knows what to do
樂不思蜀indulge in pleasure and forget home and duty
樂此不疲to enjoy sth and never tire of it