adj.擦不掉的;永久的,持久的;不可磨灭;
例句:
His concern for the masses made an indelible impression on us.
他对群众的关怀给我们留下不可磨灭的印象.
This creates an indelible aura of mystery.
这会营造一种不可磨灭的神秘气息.
The war has made an indelible mark on the world.
战争给世人留下了不可磨灭的印记。