die out|died out|dying out

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.