1. They invariably live nearby and are always available for an informal chat or an evening´s entertainment.
    因为他们都住在附近，你随时可以同他们聊天或在晚上一起娱乐。

2. The survey revealed what I had already suspected from informal polls of students both in Macon and at the Robins Resident Center:
    这份调查报告揭示了我以前在梅肯和罗宾斯学生寄宿中心对学生进行的非正式民意调查的结果：

3. He paid an informal visit.
    他做了非正式的访问。

4. A colloquialism is a word or expression often used in informal speech.
    俗语是在非正式讲话时常用的字或措辞；

5. Over the years, one may well become an authority on one´s hobby and will very probably be asked to give informal talks to little gatherings and then,
    一人积了多年经验会成为自己这种爱好的权威，很可能应邀在小型集会上作非正式的讲话。