1The doctor inserted a cannula into a vein in her arm to administer the medication.
2The comedian's humor was characterized by a vein of sarcasm that left the audience in stitches.
3The company's success was built on a vein of innovation that ran through every level of the organization.
4The artist's use of color revealed a vein of melancholy that underpinned the entire collection.
5The discovery of a rich vein of copper ore in the region sparked a mining boom that transformed the local economy.