Ecology can be written about without relying on well-worn examples such as tropical rain forests.可以不用热带雨林等老生常谈的例子来讲述生态学。To use a well-worn cliche, it is packed with information.说得老套一点，其内容翔实。Before you is a well-worn path of beaten earth.你面前的是一条被踩平了的破破烂烂的小路。