Everyone has experienced this feeling at one time or another.每个人都曾体验过这种感受。We all do foolish things at one time or another. 有时我们都免不了做些傻事。All of these industries have at one time or another been linked to cancer.所有这些产业都曾在不同时期与癌症有过联系。All of them were French possessions at one time or another.它们曾经全都是法国属地。