According to the concept of topological chain recurrent, a special flow "non-compact flow" is introduced on metric space, some properties and examples of this flow are given.

通过拓扑链回归概念，在非紧致度量空间中引入一类特殊的流———非紧致流，同时给出该类流的一些特性和实例。

youdao

This is actually a recurrent figure in the early poems, isn't it wonderful that there's a term for being turned to marble?

这事实上是在早期诗歌多次出现的一个形象，有一个术语形容变成石头，是不是很美妙？

耶鲁公开课 - 弥尔顿课程节选

Ironically, cannibalism in many forms is a recurrent theme in Cloud Atlas, but this material feels all-too familiar, and not in a cheeky, knowing way.

FORBES: Review: 'Cloud Atlas' is a Noble Disaster

The researchers compared a group of 105 women who had all suffered recurrent spontaneous miscarriages with a carefully matched control group of 91 postmenopausal women who had never had a miscarriage and who had given birth at least twice.

BBC: Miscarriage gene identified

Giving to and helping others has always been a recurrent theme in the Holiday Season.

FORBES: A Message For Our Time