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Each delivery order is only valid to a single address.

每个订单只限一个送货地址。

Generally speaking, a single entry visa is valid for 3 months with duration of stay 30 days.

根据规定，一次入境签证有效期一般为三个月，停留期为30天。

We have identified some simple principles: singlehood is a valid life-style, just as being married is.

我们看到一些简单准则：单身生活，就像婚姻生活一样，是一种正常的生活方式。

Theme: Since God sees singlehood as a valid life style, with His help we can truly live a full life as single man and woman.

主旨 ﹕因为单身生活是神所喜悦的，靠著祂的恩惠我们能有一个满足的生命。

The steady-state assumption is always valid for both singlet States of ??

在中午，稳定态的假定对？

The siphonic drainage system, also called press drainage system, is a more advanced roof drainage system in the world. It is applied widely in large-scaled workshop, exhibition, airport lounge and gymnasium whose roofs have large span and complex structure, and its a valid way to solve roof drainage.

虹吸式屋面雨水排水系统也称压力流排水系统，是当今国际上较为先进的屋面雨水排放系统，它被广泛应用于大型厂房、展览馆、候机楼、体育馆等跨度大、结构复杂的屋面，是解决屋面排水的有效途径。

In this thesis, I summarize the theoretical calculation method, applied scope and notice of siphonic drainage system, and point out the advantage of siphonic drainage system compared with gravitation drainage system. In the archetype experiment study of siphonic drainage tube, I adopt different tube diameter and different structural height to survey the drainage volume and press in different place. I observe various kinds of flow state, and get chief factors which influence hydraulic peculiarity of system as the tube diameter or structural height, and find out the relevance of factor to flux. I apply CFD Fluent software and adopt standard k-ε model and RNG k-ε model, then use finite volume method and second-order upwind scheme to discrete numerical model, while coupling numeration of velocity field and press is based on SIMPLE. In the numerical simulation of curved part of tube, siphonic drainage tube experiment system and multi-outlet siphonic drainage system, I make research on internal velocity and press of system in different project condition by changing the tube diameter of curved part, negative press value in tube export and improving the quantity of water gutter. This thesis first adopts a method of combining archetype experiment and numerical simulation to study the siphonic drainage system, test and verify the validity of experiment and numerical simulation, and makefurther study on system, it solves the problems of limited testing conditions, and has a logical results, it can provide a valid method for optimizing and designing the drainage tube-net system. The conclusion have referring value for study and design of siphonic drainage system.

本文首先对虹吸式排水系统理论计算方法、适用范围以及注意事项做出总结，并分析了虹吸式排水系统的优势；再对虹吸式排水管道进行原型试验研究，采用不同管径不同立管高度，对系统流量、管道压强进行量测，观察了各种工况下的流态，对其水力特性进行研究分析，找出影响水力特性的落差、管径主要因素以及与排水量的关系；进一步应用计算流体力学Fluent软件，采用标准κ-ε模型与RNGκ-ε模型，计算过程应用有限体积法和二阶迎风格式对数值模型进行离散，速度和压力的耦合采用SIMPLE算法，分别对系统弯管段、虹吸排水管道试验系统、多斗虹吸式排水系统进行数值模拟分析，通过改变管段弯头处半径、管段出口负压值、增加雨水斗数对不同工况下系统内部的速度和压力进行研究；本文首次采用结合原型试验与数值模拟相结合的方法，对虹吸式屋面雨水排水系统进行研究，试验与模拟相互验证，并进行拓展，很好地解决了虹吸式屋面雨水排水系统由于试验条件限制问题，结果正确合理，为排水管网系统设计和优化研究提供了有效的方法，对工程设计有较好的参考价值。

Accordingly, strengthening the construction of skeleton grid is the ultimate resolvent to ensure secure-and-reliable operation of power system. However, an economic and valid approach to strengthen the skeleton grid is to construct the ultra high voltage transmission lines.

因此，加强骨干网架建设是保障系统稳定运行的根本解决办法，而加强骨干网架经济而有效的途径是建设特高压输电线。

However ,logical and valid the arguments may be , they only skim the surface of the issue .

不管这些争论显得多么有理和有效，它们只是看到了问题的表面。

However logical and valid the arguments may be,they only skim the surface of the issue.

不管这些争论显得多么有理和正确，他们只是看到了问题的表面。

"The operators will suffer a temporary decrease in the number of consumers and short message services as people may not like having to provide their ID cards for a phone number," Xu Junqi, vice-dean with the Policy-Making Institute of the Telecommunications Research Centre under MII, said yesterday.

信息产业部下属的通信决策研究院副主任徐俊其昨天说：&实行手机实名制后，人们可能不太情愿用身份证注册手机号，所以通信运营商会暂时面临用户减少和短信用户减少的问题。&

I don't believe in make-believe!

我不相信这些虚构的故事。