Definition: to become more and more rare and then disappear completely Level: B2
许多恐龙物种在数百万年前灭绝了。
Many species of dinosaurs ___died ___out millions of years ago.
由于栖息地丧失和污染，许多动物面临灭绝的危险。
Many animals are in danger of ___dying ___out due to habitat loss and pollution.
如果不积极保护，这种古老的文化传统将会消失。
Without active preservation efforts, this ancient cultural tradition will ___die ___out.
