昆虫和蠕虫都是无脊椎动物。Insects and worms are all invertebrates.在蚯蚓和许多其它无脊椎动物中, 这些排泄结构称为肾管.In the earthworm and many other invertebrates, these excretory structures are called nephridia.公园里的本地特有的脊椎动物和无脊椎动物也很多.Endemism of vertebrate...
由于他们属于软弱无力的少数,他们反对总统的决定实际上枉费唇舌.Those who protested against the president's decision were actually barking at the moon , since they were in a powerless minority.别白费唇舌了,你决说服不了她.You can save your breath: you'll ne...
鱼的鳍就像水翼船艇的水翼.The fins of a fish act as hydrofoils.关键词: 二维水翼 、 重模式 、 由水面.Keywords: two - dimensional hydrofoil , double model, free surface.水翼艇在水面漂流.The hydro craft floated over the water....