孤独症用英语表达为"autism"。这个词来源于希腊文的"αυτός"，意为"自我"，表示人们患有孤独症时，他们可能会有自我中心、与外界隔绝的特征。例如：

John was diagnosed with autism when he was three years old.

The autism center offers a range of services for children and adults with autism.

Many people with autism have difficulty communicating and interacting with others.

在上面的例句中，"autism" 分别用来表示孤独症的诊断、专门为孤独症患者提供的服务、孤独症患者在沟通交流方面的困难。