棱皮龟没有鲸脂，但它们有和爬行类动物相似的结构：厚且含油的皮肤，下面有一层纤维，再下面是脂肪组织。
Leatherbacks do not have blubber, but they do have a reptilian equivalent: thick, oil-saturated skin, with a layer of fibrous, fatty tissue just beneath it.
选择三层结构的BP神经网络，建立镁合金微弧氧化膜厚的映射模型。
The mapping model of film thickness of micro-arc oxidation(MAO) on magnesium alloys is built on BP neural network with three layer structure.
此外，厚松散层、地表采动程度、工作面推进速度、采煤方法与顶板管理方法、开采程序及时间因素等对采场覆岩空间结构均有一定影响。
Moreover, there are some other influencing factors such as: thick loose bed, surface mining degree, impel speed of working face, coal mining and roof manage methods, mining procedure and time.
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