laugh before breakfast you'll cry before supper

After joy comes sadness

be positive

to enjoy sth and never tire of it

indulge in pleasure and forget home and duty

cut and dried, cliché，stereotype

the devil knows many things because he is old

an old hand is a good guide;an experienced worker knows what to do

to harp on the same string

there's many a good tune played on an old fiddle

to eat very quickly and ravenously

villains collude together;to work hand in glove with sb.

fill a position just to make up the number (lit. to play the yú 竽 mouth organ to make up numbers)

be as drunk as a lord

there will be ample time

Easy come, easy go

in everyone's mouth

bitterness finishes;sweetness begins;the hard times are over;the good times just beginning

oral expressions can not be taken as evidence;words of mouth alone don't carry conviction

saying something that one does not mean (lit. mouth says yes;heart no)