diāo nàn
to be hard on sb
to deliberately make things difficult
bǎi bān diāo nán
to put up innumerable obstacles
to create all kinds of difficulties (idiom)
fàng diāo
to act wickedly
to bully
to make life difficult for sb by unreasonable actions
Diāo fān dōu
Diophantus of Alexandria (3rd century AD), Greek mathematician