1. 猜想;觉得
    You use suspect when you are stating something that you believe is probably true, in order to make it sound less strong or direct.

    e.g. I suspect they were right...
           我感觉他们是对的。
    e.g. The above complaints are, I suspect, just the tip of the iceberg...
           我想，以上的抱怨只是冰山一角。

2. 怀疑;疑心
    If you suspect that something dishonest or unpleasant has been done, you believe that it has probably been done. If you suspect someone of doing an action of this kind, you believe that they probably did it.

    e.g. He suspected that the woman staying in the flat above was using heroin...
           他怀疑楼上公寓里的那个女人正在吸食海洛因。
    e.g. Police said they suspected that Sobhraj had accomplices who are drug smugglers...
           警方说他们怀疑索布拉还有一些走私毒品的同伙。

3. 嫌疑犯;可疑分子
    A suspect is a person who the police or authorities think may be guilty of a crime.

    e.g. Police have arrested a suspect in a series of killings and sexual assaults in the city.
           警察已经逮捕了一名涉嫌在该市犯下一系列杀人及强奸案的嫌疑犯。

4. 不可靠的;不可信的;可能有假的;可疑的
    Suspect things or people are ones that you think may be dangerous or may be less good or genuine than they appear.

    e.g. Delegates evacuated the building when a suspect package was found...
           发现可疑包裹后，代表们撤离了这座楼。
    e.g. The firm has taken out adverts in national newspapers to urge customers to return suspect products...
           该公司在全国性的报纸上登出广告，催促顾客退回疑似假冒产品。