1. One authority on spiders made a census of the spiders in a grass field in the south of England,
    一位研究蜘蛛的权威对英国南部一块草坪上的蜘蛛作了一次调查。

2. 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。

3. It had been purchased by a local authority so that an enormous pie could be baked for an annual fair.
    某地方当局买下它用来焙制一个巨大的馅饼为一年一度交易会助兴。