导弹
发表于 2025-3-21 19:22:54
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arcane
发表于 2025-3-21 21:50:17
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施舍
发表于 2025-3-22 03:23:15
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压舱物
发表于 2025-3-22 07:29:18
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飞行员
发表于 2025-3-22 11:21:23
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无法解释
发表于 2025-3-22 13:27:59
Introduction,quirements. This is possible for animals living in an aquatic, or at least a damp, environment; but for a terrestrial existence the permeable body surface necessary for such a mode of respiration would lead to rapid desiccation. However, as body size increases so general diffusion becomes progressiv
indemnify
发表于 2025-3-22 19:06:22
Gills, Podia and Papulae,l slits are present, but no gills. The term ‘gill’ can be applied to any outgrowth of the body wall that is primarily concerned with increasing oxygen uptake from the surroundings, and includes in this context not only the serially repeated gills of annelids, arthropods and certain molluscs and the
Mangle
发表于 2025-3-22 21:57:56
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atrophy
发表于 2025-3-23 05:04:46
Tracheal Systems,in a few molluscs and crustaceans. They are primarily an adaptation to the terrestrial environment, but a number of species possessing them have become secondarily aquatic. Among the arthropods they are typically found in most insects, chilopods (centipedes), diplopods (millipedes) and symphylans, a
fallible
发表于 2025-3-23 09:29:51
Circulatory Systems,upplying the circulatory needs of the animal and so the pathway of oxygen to the tissues must be facilitated. This has been achieved in many cases by the development and elaboration of a system of sinuses or vessels which contain a fluid (blood). A contractile mechanism is usually developed to pump