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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。

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。

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。

The first and second syllables constitute a disyllable group, and the first syllable changes according to the initial syllable of the disyllable group.

即第一、二两个音节构成一个两字组，第一个音节按两字组的前字变；第二、三两个音节构成一个两字组，第二个音节按两字组的前字变，第三个音节按两字组的后字变。

The first few chapters, covering divisibility, prime numbers and modular arithmetic, assume only basic school algebra, and are therefore suitable for first or second year students as an introduction to the methods of pure mathematics.

最初的几个章节，涉及分割，素数的和模块化的算术，只承担基础学校代数，因此，作为一个纯数学的方法引入第一或第二年的学生更合适。

But when sleep comes to close each difficult day, When night gives pause to the long watch I keep, And all my bonds I needs must loose apart, Must doff my will as raiment laid away,— With the first dream that comes with the first sleep, I run, I run, I am gather'd to thy heart.

但是，当睡眠来关闭每个艰难的一天，当夜幕给予暂停长期看我不断，和我所有的债券我需要，必须松散之外，必须脱我将作为服饰规定以外，-随着第一个梦想来的第一次睡眠，我跑，我跑，我采集到你的心。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。