pain/ peɪn /

1.noun [c/u] 
(physical) 疼痛

2.noun [u] [fig] 
(unhappiness) 痛苦

3.noun [inf] 
to be a pain (in the neck) (nuisance) 讨厌的家伙

to have a pain in one's chest/arm
胸痛/胳膊疼
to be in pain
在苦恼中
to take (great) pains to do sth
尽力做某事
to take (great) pains with/over sth
对某事煞费苦心
what a pain!
 [inf] 真讨厌!
on pain of death/imprisonment
违者以死/监禁论处