4、A pink jellyfish - that resembles a small spaceship - floats in the deep sea. The body of an adult jellyfish is a bell-shaped, jellylike substance enclosing its internal structure, from which the creature's tentacles suspend. Each tentacle is covered with stinging cells (cnidocytes) that can sting or kill other animals: most jellyfish use them to secure prey or for defence.
这不是太空中的外星人飞船，而是漂浮在深海里的一只粉红色水母。成年水母的体型酷似铃铛，水母的身体内部被一种类似果冻状物质包裹。它的触须从体内伸出，每根触须上都带有可以伤害甚至杀害其他动物的毒刺。水母大都用这些刺来捕食或自卫。
