Secondly, happiness consists in contentment. A man who is dissatisfied with his present condition is always in distress.

Second, happiness consists in contentment.

其次，快乐在于知足。

The thesis unifies the Specific property of kinematic pairs with the screw Displacement Matrix.

从而将这类运动副的运动特性,统一到了螺旋位移矩阵之中.

Following introduces one kind grind auxiliary method of worm gear in the lathe.

介绍一种在车床上研磨蜗轮副的方法.

Traditional design of hydro-viscous drive always uses the friction pairs of damp clutch indiscriminately.

传统液粘调速离合器技术借用湿式离合器摩擦副的设计方法,现已无法完全满足实际工程需要.

A mathematic model of joint clearance is important for the dynamic study of the mechanisms.

为了研究含间隙机构的动力学特性,首先要建立运动副的间隙模型.

Tests indicated that it could in situ strengthen and repair surfaces of iron base friction counterparts.

试验、检测的结果表明,这种金属磨损自修复材料可以原位强化和修复铁基摩擦副的工程表面.

An automatic measuring and testing system for end-face friction and wear experiment was designed.

端面摩擦磨损试验可以模拟和检测面接触摩擦副的摩擦学特性.

Assembly has a great influence on the quality of high precise linear motion rolling guide.

给出四方向等载荷型哥德式沟槽直线滚动导轨副的装配关系.

The rule and the composition of the ball screws were analyzed.

分析了滚珠丝杠副的原理及结构形式.

By convention the deputy leader is always a woman.

按照惯例这一领导人的副职总是由女子担任.

A marshal handed mike a welcome and introduces these leaders.

一位风度的司仪手握话筒,热情欢迎和介绍了领导的名单、职务(全是副职).

He is standing against the present deputy leader in the leadership contest.

他正在与现任副职领导人角逐领导的地位.

There is a linear relationship between boron content and toughness. The boron content must be controlled below 0.0020% in order to make AKV ≥ 50J. A discussion was made on the cause of influence of boron on the low temperature toughness.

为了使-20℃的V型缺口试样冲击功A（Kv）≥50J，必须将酸溶硼含量控制在0.0020%以下，分析了硼影响韧性的原因。

Akabane virus ( AKV) causes abortion, premature birth, stillbirth, and congenital deformities such as arthrogryposis-hydranencephaly syndrome in cattle, sheep, and other animals.

赤羽病是由阿卡班病毒引起牛、羊等动物流产、死产、死胎、胎儿畸形、以及先天性关节弯曲-积水性无脑综合征的一种虫媒传染病。

Since then, the young science lover started to try to find the healthiest free-range chickens.

从那时起,这位年轻的科学爱好者开始尝试寻找最健康的自由放养鸡。

You should try to combine exercise with a healthy diet.

你应该把锻炼和健康饮食结合起来。

First, some basic facts about healthy eating!

首先，说说健康饮食的几点基本事实！

Computer Simulation and Calculate CRT AMH System Adjust Matrix

彩色显象管AMH系统调整系数矩阵的模拟计算

The calculation method in computer aided design ( CAD) of AMH system is introduced.

应用计算机辅助设计（CAD），采用表面磁荷法计算AMH系统中空间磁场分布，用龙格-库塔法模拟计算电子轨迹。

In AMH group, all the patients were hypertensive and their 24 h urinary VMA was increased. Most of them ( 15/ 16) had higher urinary catecholamine level than normal;

肾上腺髓质增生患者均有高血压，24h尿VMA均增高，大部分（15/16）患者尿儿茶酚胺高于正常；