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Contraception is not just a personal, but also a larger social issue.

避孕不仅仅是一个个人问题，而且也是一个很大的社会问题。

Over the long term the sum of simple conservation measures would render larger restoration work superfluous - certainly the ideal case of maintenance but in fact nothing other than the service contract for the heating system or the washing machine.

如此一来，艺术作品的损害可以提早发现，细微的损坏可以由修复师每年定时修理而不须庞大的开销；长期下来，这些简单维护措施的累积效果，将使得大型的修复工作不复需要——当然这种保养合约与暖气系统或洗衣机的服务契约内容其实是相去不远的。

Compared with dissymmetrical engines, the results show that the contrapositive cam engine can balance the axial force with larger torque output and lower loads on shafting bearings.

研究结果表明，虽然对置后发动机轴向长度有所增加，但主轴轴向力能完全平衡，主轴产生转矩大，轴承负荷小，可提高功率。

For the development of the securities market of China's financial reform and contribute to the larger force.

为对中国的金融改革证券市场的发展，并作出贡献更大的力量。

The city is the twentieth most populous in England; the larger Tyneside conurbation, of which Newcastle forms part, is the sixth most populous conurbation in the United Kingdom.

纽卡斯尔在英格兰最受欢迎的城市中排第20位；纽卡斯尔是英国第六大最受欢迎城镇群的大泰恩河畔城镇群的组成部分。

It leads to significantly lowered and expanded profiles for the Reynolds correlations, and a larger temperature gradient in the central part of the super-adiabatic convection region but a small one near the boundaries of the convection zone.

研究发现，如果适当选取自由参数的值，则不论是采用局地还是非局地Reynolds应力模型的太阳模型都可以得到比标准太阳模型更符合观测结果的理论振动频率。

The instability originated in the upper R_B-like convection zone develops to larger region with the increase of Grashof number, and the number of non-axi-symmetric circulations decreases. When Grashof number exceeds another critical value, cooling air may invade the cavity and flow toward the shroud, the circulations decrease to one pair occupying the whole cavity in radial, thus these two zones are merged into one. The core structures in the cavity rotate against the disks, while the structures keep no change at the case of periodic oscillatory flow. With the Grashof number rises, the flow undergoes stable, periodic, periodic with cool air invading, quasi-periodic and ultimately to chaos.

离心浮升力是造成非等温轴向通流旋转盘腔内流动不稳定的主要因素，而哥氏力的存在加剧了流动不稳定性，导致流场失稳提前发生，而且在哥氏力的作用下流线发生偏转，盘腔内r-θ面出现了旋向相反的对涡，流动结构更加复杂化；随离心浮升力的继续增加，r-θ面的对涡减少，当其超过某一临界值后部分冷流体侵入盘腔，对涡减少至一对，而且沿径向充满整个盘腔；此后随离心浮升力的增加对涡的数量不再变化；r-θ面的对涡相对于盘面周向移动，但是形状基本保持不变。

However in order to change the fate of human history, larger groups must convene .

然而为了改变人类历史的命运，必须召集更大的群体。

Order to change the fate of human history, larger groups must convene.

变人类历史的命运，必须召集更大的群体。

The practical simulation results show that the improved genetic algorithms has greater converg e speed and larger probability of getting the best solution.

实例验证表明，改进的遗传算法的收敛速度和获得全局最优解的概率都有很大的提高。

Now, however, all children continue in "comprehensive" schools, and the eleven-plus determines which courses of study the child will follow.

然而现在，所有的孩子都要在综合学校继续学习，所以这次考试只是决定他们将要学习哪些课程。

Cultivatable land , and led to a general recognition that development must not be carried at the cost of agriculture .

城区的迅速扩大在很多情况下侵占了宝贵的可耕地，使人们普遍认识到发展不能以牺牲农业为代价。