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Clinically, ventricular systole is regarded as the period between the first and second heart sounds, while diastole is the time between the second heart sound and the first heart sound of the next cycle.

临床上，心室收缩被视为间的第一和第二心音，而舒张期之间的时间是第二心音第一心音的下一个周期。

In the first four sections of this paper, these basic knowledge and calculational methods for the study of potential energy function are simply introduced. 9-parameter Murrell-Sorbie analytical potential energy function that can accurately describe especial potential energy function of diatomic molecule is obtained through calculations and analysis for the first time.

本文前面部分在简单介绍与分子势能函数研究相关基础理论知识和计算方法的基础上，通过计算、分析比较，首次得到了能够正确描述双原子分子特殊势能曲线的九参数Murrell-Sorbie解析势能函数。

Used in the First Epistle of St. Peter, in the Epistle of St. Polycarp, in the works of St. Justin, perhaps in the Didache and I Clement, it appears to have been already well known towards the end of the first century.

用於第一使徒圣彼得在使徒圣波利卡普，作品中街贾斯汀，也许是在十二使徒遗训，我克莱门特，它似乎已经众所周知快要结束时的第一个世纪。

To sum up, we first conclude that we can isolate mesenchymal stem cells from human fetal articular cartilage and they can be induced to differentiae into several cells under appropriate induction conditions. Anymore, they have their original tissue speciality. Therefore, we first report that mesenchymal stem cells of articular cartilage origin are superior to mesenchymal stem cells of bone marrow origin as seeding cells of cartilage tissue engineering and we provide a kind of new seeding cells of cartilage tissue engineering for the future clinic application.

综上所述，我们首次报道不仅可从人胚胎的关节软骨中获得间充质干细胞，而且软骨来源的间充质干细胞除具有骨髓来源的间充质干细胞的多向分化能力外，还具有其来源的软骨组织特异性，那么，其作为软骨组织工程的种子细胞要优于骨髓来源的间充质干细胞，从而首次提出了一种新型的软骨组织工程的种子细胞，对于未来的软骨组织工程的临床应用提供理论依据。

The boundary value problem for first-order differential equations with a parameter refers to the finite solution condition of equation which includes unknown quantity and its first-order derivative that not only relies on interval value but also relies on the parameter of the equation,which is always settled by fixed point theory or successive approximation method.

含一个参数的一阶微分方程边值问题是指：含有未知量及它的一阶导数的方程的定解条件不仅依赖于在区间端点的取值，而且依赖于方程中的参数。通常它用不动点定理或逐步逼近法来解决。

First, the digraph is used to represent the topology of multi-agent systems, and then, a first-order integrator model and a consensus convergence criterion of systems are established.

首先提出了能使用有向图表示的多智能体网络系统的拓扑结构，并根据该拓扑结构建立了网络系统的1阶数学模型和提出了多智能体网络系统一致收敛准则。

The second groove intersects the first groove set at an intersection angle such that the first optical surface (142) intersects the second optical surface (144) to define an orthogonal dihedral angle between the two surfaces.

第二沟槽组与第一沟槽组以一交角相交，以使第一光学表面（142）与第二光学表面（144）相交，而在两个表面之间限定一垂直二面角。

The Directress: AMI certified 0-3 teacher, the first batch of AMI international certified teacher, major in preschool education, First-grade Teacher, Beijing Dance Academy Teaching Certificate Education, Teaching Certificate Education.

主教老师具有AMI 蒙台梭利0-3岁职业教师国际认证，中国首批AMI国际认证教师，学前教育专业，一级教师。拥有北京舞蹈学院中国舞1、2、3级教师资格证书、婴幼儿科学识字教师资格证书。

Disciplinary Knight, pull 30 + yards into the fight, start to slow down the freedom to steal, steal basic win, steal security if we do not rely on, hold the first round of the two shield硬拼Austrian gas will be strong for the first round, the fastest of pressure Invincible, the second wake-up call to do after the disappearing trick.

惩戒骑士，拉30+码进战斗，开局减速，偷自由，偷得到基本赢，偷如果不保靠，撑两个盾第一轮硬拼，奥强气定给第一轮，最快化压无敌，第二波唤醒消失做后招。

Specifically, if the first disjoin of an or is true, the value of that disjoin becomes the value of the expression, without evaluating the rest; if the first conjoin of an and is false, its value likewise becomes the value of the whole expression.

具体地说，如果 or 表达式的左边部分为 true，那么就不用对其他部分进行求值了，这部分的值直接成为整个表达式的值了；如果 and 表达式的左边部分为 false，那么同样这部分的值也是直接成为整个表达式的值了。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。