The president said their courage almost defies imagination.

总统表示他们的勇气几乎颠覆了想象力。

Scientists have found creatures that defy imagination--fishes with transparent heads, jellyfish that resemble UFOs, and squids that look like fireworks.

科学家们发现了超乎想象的生物——头部透明的鱼类、类似不明飞行物的水母以及看起来像烟花的鱿鱼。