例句與造句

1. Johnson and Wilentz have given the reader a small historical gem : a book that fascinates and entertains, even as it illuminates a dark, persistent vein in American history.
2. The current state of legal restrictions / threats may affect major publishers, but a persistent vein of popular culture happily associates Landmark Education and aspects of culthood-- even in the heartland-homeland of Landmark Education's activities.
3. The Merrifield vein which varies in strike from N . to N . 20?W . and had an average dip of 35?E ., was one of the longest and most persistent veins in the Nevada City district.
4. It's difficult to find persistent vein in a sentence. 用persistent vein造句挺難的