What these studies and observations of animals’ sleeping habits tell us is not only more about the natural world but more about the origins of sleep, how old it is, and why we have evolved to do it. If jellyfish, which are the oldest multicellular animals in the world (500 million yea...
glowing jellyfish-shaped object, known as thePetrozavodsk phenomenon.It had puzzled Soviet scientists but was quickly solved by American military personnel, who recognized the light and shape as part of a Soviet ballistic missile test that had been hidden from Soviet scientists by their own governmen...
aThe overall structure is sound although there are examples where a particular section is too long or too short. A climax is identified but is not effectively described or led up to. Sentence sequences narrate events and occasionally contain intrusive facts or misleading ideas. 整体结构是酣然的,...