Although sea jellies have no brains, no skeletal structures and very few internal organs, these simple and mysterious creatures are one of the most widespread, amazing and graceful species on earth.

• 虽然水母没有大脑、也没有骨架，仅有非常少的内部器官，但是这些简单却神秘的生物，却是地球上分布最广的、最惊人和最优美的生物。