Idioms describing serious work:

Conscientiously

Diligently and conscientiously

In full swing

Struggling to be the first

Sweating profusely

Sweating profusely describes the seriousness of labor in writing: the broom behind the door---specializes in picking up dirty things and doing them to make mountains and plains---when a little makes a lot, the tortoise turns into an eel--- Disarmed and returned to the field

?The cloth for wiping the table---specialized in doing dirty things like fetching water and washing vegetables---getting the best of both worlds

?A beggar borrowing an abacus---being poor Poor people want to be dumb and talk---make ants' legs with their hands---diligently plant ginger and raise sheep---Ben Shaoli never leaves his mouth with his fists and his songs---did he practice?