联系阶段 associative stage
关系阶段 relationship phase
阶层关系 relations among among people from all walks of life ; Level Relation ; hierarchical relationships ; Hierarchical Relation
递阶系统 [自] hierarchical system
阶层体系 hierarchy ; class hierarchies
物种系阶段 vertebrate phylotypic period
奥陶系阶名 ordovician stage names
一阶系统 First-order systems ; first-order system
系统阶段 Management Information System
袋状附加阶梯系统 PALSPouch Attachment Ladder System
作用在任意运动物体（系）上的力和力矩可以分别表示成流场中动力学涡量的一阶矩和二阶矩随时间的变化率。
The force and moment exerted on the solid body are expressed as the rate of change of the first-and second-order kinetic vorticity moments, respectively.
全球寒武系内的首个全球标准层型剖面和点位——“芙蓉统”和“排碧阶”的底界层型正式在我国确立。
The first intra-Cambrian GSSP for the base of global Furongian Series and Paibian Stage has been established in South China.
将牵引车的传动系简化为一个2自由度的扭转振动系统，并以二阶微分方程描述。
The driveline for a tractor vehicle is simplified as a 2-DOFs(degree of freedom)torsional vibration system, and is described as a second-order differential equation.
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