ache          
 noun [ C ] uk/eɪk/ us/eɪk/
B1 (持续的)疼痛,隐痛
a continuous pain that is unpleasant but not very strong
 aches and pains As you get older, you have all sorts of aches and pains. 人老了,就会有各种各样的病痛。 
dull ache I've got a dull (= slight) ache in my lower back. 我背部靠近腰的地方隐隐作痛。 
 B1 (与表示身体部位的词一起构成合成词,表示该部位的持续疼痛)
used in combinations with parts of the body to mean a continuous pain in the stated part
  earache/a headache/toothache/backache 耳痛/头痛/牙疼/背痛 
 I've had a stomach ache all morning. 我胃疼了一上午。 
 - More examples
 - She felt a persistent ache at the back of her head.
 - He's been suffering various aches and pains for years.
 - No, it isn't a sharp pain - just a general ache.
 - She complained of an ache in her shoulder which kept her awake at night.
 - This painkiller is good for general aches and pains, but maybe you need something stronger?
 
ache       
verb [ I ] uk/eɪk/ us/eɪk/
B2 (持续地)疼痛,隐痛
to have a continuous pain that is unpleasant but not very strong
  My head/tooth/back aches. 我的头/牙/背疼。 
 I ache/I'm aching all over. 我浑身疼痛。 
 I've got one or two aching muscles after yesterday's run. 昨天跑步之后我有一两处肌肉隐隐作痛。 
 - More examples
 - If you're not used to exercise your joints may ache the next day.
 - My arms ache from carrying this bag.
 - My back really aches after moving those heavy boxes around all day.
 - After my exercise class, my whole body ached.
 - She's aching and shivering, so I've sent her to bed.
 
Phrasal verb   
ache for something 渴望
to want something very much
  He was lonely and aching for love. 孤独的他渴盼着爱的甘露。