The existence of layers of water of different density in a lake or other body of water 成层现象：湖水或其他水体中因为密度差异而自然形成不同水层。
Primary vascular tissue , which is found in all vascular plants , is formed from the procambium 初生维管组织由原形成层发育而来，在所有维管植物中都有存在。
Study on surface contact stress distribution properties for multi - layered foundation during dynamic consolidation 强夯作用下成层地基的表面接触应力分布特征
An analytical solution of internal force and deformation for anchorage length of abti - slide pile in layered rock mass 成层岩体中抗滑桩锚固段内力变形计算解析解
Oolitic limestones are rare and interbedded in the dark - gray mudstones and / or shales 这些砂岩和鲕粒灰岩既可单独成层，但更常见它们与深灰色泥页岩组合成薄互层。
A quasi - analytical solution to soil - pile interaction in longitudinal vibration in layered soils considering vertical wave effect on soils 成层粘弹性土中桩土耦合纵向振动时域响应研究
Based on these solutions , the dynamic responses of integral pile and pile with various impedances are investigated 基于所得解，对饱和成层土中的完整桩及各类变阻抗桩的振动特性进行了分析。
Protophloem the first - formed primary phloem , differentiated from the procambium in the region just behind the meristem 原生韧皮部：最早形成的初生韧皮部，由位于分生组织中的原形成层分化而来。
The pile is assumed to be vertical , elastic and of variable impedance , and the soil is layered and with viscous damping 假定桩为竖直弹性变阻抗体，土为成层线性粘弹性体，其材料阻尼为粘性阻尼。
Classes of objects can also be further grouped into hierarchies , in which objects of one class can inherit methods from another class 对象的类也可更进一步组合成层，而在层中一个类的对象可继承另一个类的方法。
