The short-term training class has been run three times.
短训班办了三期。
《新英汉大辞典》
2
Despite hearing this term thousands of times during the course of our lives, very few people have deeply considered what it's really about.
尽管一生中我们会成千上万次地听到这个词，但是几乎没有什么人好好琢磨过它到底意味着什么。
3
It maintains that the only way to manage resources fairly is to treat water as a common resource "stewarded for the long-term public good, in good times and bad".