1 [C,U] the unpleasant feeling that you have when a part of your body has been hurt or when you are ill 痛；疼: to be in pain 感到疼痛He screamed with pain. 他痛得尖叫起来。chest pains 胸口疼痛 ☞We use ache for a long, continuous pain and pain for sudden, short, sharp periods of pain. Therefore we usually say I've got earache/backache/toothache/a headache but He was admitted to hospital with pains in his chest.For the use of ‘a’ or ‘an’ with ache, look at the note at ache. 持久的痛叫做ache，突然间短促的剧痛叫做pain。因此通常说：I've got earache／backache／toothache／a headache.我耳痛╱背痛╱牙痛╱头痛。但要说：He was admitted to hospital with pains in his chest.他突然胸口痛而住院。有关ache跟a或an连用的问题，参看ache的注释。

2 [U] sadness that you feel because sth bad has happened 痛苦；悲痛: the pain of losing a parent 丧父╱母之痛