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unexpressive    
未能表达原意的

未能表达原意的

unexpressive
adj 1: deliberately impassive in manner; "deadpan humor"; "his
face remained expressionless as the verdict was read"
[synonym: {deadpan}, {expressionless}, {impassive}, {poker-
faced}, {unexpressive}]


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  • Ammonoidea - Wikipedia
    Ammonites were devastated by the end-Triassic extinction, with only a handful of genera belonging to the family Psiloceratidae of the suborder Phylloceratina surviving and becoming ancestral to all later Jurassic and Cretaceous ammonites
  • What is an ammonite? - Natural History Museum
    Ammonites were shelled cephalopods that died out about 66 million years ago Discover when they lived, why they went extinct, why they're important to science, and much more
  • Ammonites: What Is An Ammonite? - FossilEra. com
    Ammonites were extinct, predatory marine mollusks that thrived in Earth’s oceans for more than 170 million years These animals were cephalopods—relatives of modern octopus, squid, and cuttlefish—and possessed well-developed eyes, multiple tentacles, and a coiled external shell
  • Where Are the Ammonites Today and Why Did They Disappear?
    What Were Ammonites? Ammonites were shelled marine mollusks in the class Cephalopoda, related to modern octopuses, squids, and nautiluses They possessed an external, chambered shell, typically coiled in a flat spiral, which they used for buoyancy control
  • Ammonites, facts and photos | National Geographic
    With squidlike tentacles extending from their distinctive multichambered shells, the extinct marine predators known as ammonites were once among the most successful and diverse animals on Earth
  • Ammonites – Fossil Cephalopods, Evolution, and Geological Significance
    Ammonites are extinct marine mollusks that lived from the Devonian to the end of the Cretaceous Period, roughly 400 to 66 million years ago They are among the most important index fossils, helping geologists to date and correlate sedimentary rock layers across continents
  • Ammonites - British Geological Survey
    Ammonites were marine animals belonging to the phylum Mollusca and the class Cephalopoda They had a coiled external shell similar to that of the modern nautilus In other living cephalopods, e g octopus, squid and cuttlefish, the shells are small and internal, or absent
  • DISCOVERING FOSSILS | What is an ammonite?
    Ammonites are perhaps the most widely known fossil, possessing the typically ribbed spiral-form shell as pictured above These creatures lived in the seas between 240 - 65 million years ago, when they became extinct along with the dinosaurs
  • Ammonoid | Mesozoic, Extinct, Shell | Britannica
    There is evidence that these animals consumed zooplankton, crustaceans, and other ammonoids The shells, which are either straight or coiled, served as protective and supportive structures as well as hydrostatic devices, enabling the animal to compensate for varying water depths
  • Fossil Focus: Ammonoids – PALAEONTOLOGY [online]
    They were cephalopods, and hence closely related to modern cuttlefish, squid, octopuses and the pearly nautilus In a non-scientific context, they are commonly called ammonites, but that term really includes only Jurassic and Cretaceous forms in its stricter scientific sense





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