这个村子周围有湖泊与沼泽地，隔断了与外界的联系。 The village is shut off from the world by lakes and marshes.
先天论，天性论先天论，大脑不能从外界信息中产生想法 The doctrine that the mind produces ideas that are not derived from external sources.
矫作物非正常出现而是由外界因素或作用所产生的一种结构或物质，如经固定后，在显微镜下才能看到的标本中的一种活生命组织中不会出现的结构 A structure or substance not normally present but produced by an external agent or action, such as a structure seen in a microscopic specimen after fixation that is not present in the living tissue.
耳鸣一个耳朵或两耳中的声音，如嗡嗡声或哨声，在没有外界刺激的情况下发生，通常由某种特定情况如耳朵感染、使用某种药物、听觉管道堵塞或头部受伤引起 A sound in one ear or both ears, such as buzzing, ringing, or whistling, occurring without an external stimulus and usually caused by a specific condition, such as an ear infection, the use of certain drugs, a blocked auditory tube or canal, or a head injury.
我们需要外界援助才能完成。 We'll need outside help before we can finish.