suspicion  
noun uk/səˈspɪʃ.ən/ us/səˈspɪʃ.ən/
  (FEELING)      
 B2 [ C ]怀疑,猜想 
a belief or idea that something may be true
  [ + that ] I have a suspicion that he only asked me out because my brother persuaded him to. 我怀疑是我哥哥说服他约我出去的。 
 She had a nagging/sneaking suspicion that she might have sent the letter to the wrong address. 她心烦意乱地猜想/心里暗想自己可能把信寄错了地址。 
 - More examples
 - I've got a sneaking suspicion that we're going the wrong way.
 - We always had the suspicion that their marriage was not happy.
 - I had a suspicion that he was up to something.
 - They had been fooling me all along, and I had no suspicion.
 - I had no suspicion that the firm might close.
 
  (BELIEF IN SOMEONE'S GUILT)      
 C1 [ C or U ]怀疑;嫌疑 
a feeling or belief that someone has committed a crime or done something wrong
  "I'm arresting you on suspicion of illegally possessing drugs," said the police officer. 警官说:“你涉嫌非法持有毒品,我将拘捕你。” 
 In these cases, the parents usually come under suspicion. 在这些案例中,孩子父母通常受到怀疑。 
usually UK She is under suspicion of murder. 她涉嫌谋杀。 
 In this particular case, they are above/beyond suspicion (= cannot be thought to be guilty). 在这起案件中,他们没有嫌疑。 
 His strange behaviour aroused/raised his neighbours' suspicions. 他奇怪的举动引起了邻居们的怀疑。 
 - More examples
 - He was burned up with jealousy and suspicion.
 - The enquiry cleared him of any taint of suspicion.
 - We view these latest developments with suspicion.
 - There are those who harbour suspicions about his motives.
 - Our suspicions were first aroused when we heard a muffled scream.
 
  (DOUBT)      
  [ C or U ]怀疑,疑心;不信任 
doubt or lack of trust
  Since they discovered the truth about his background, his colleagues have regarded him with suspicion. 自从他的同事知道了他的真实背景,就不再信任他了。 
 They feel that she harbours (= has) suspicions of their politics. 他们觉得她对他们的政见心存怀疑。 
   (SMALL AMOUNT)      
 [ S ]少量,一点儿 
a small amount
  He gave just a suspicion of a smile. 他只是微微一笑。 
 I have a suspicion of doubt about whether I should accept his invitation or not. 我有点儿疑虑,不知该不该接受他的邀请。