必要时

With the development of power system, many factors make the operation of power system to be not balanceable in three phases, so it is necessary to do three-phase power flow calculation under the unbalanceable state in the programming, design and operation of power system.

近年来，随着电力系统的发展，很多因素使系统的运行具有更大的不对称性，因此有必要在规划、设计及运行时进行不对称情况下的三相潮流计算。

Since any heart disease may finally cause heart failure, it's an absolute essential procedure to carry out real-time monitor and estimation of the heart inotropic, chronotropic and dromotropic effect in the diagnosis and treatment of cardiovascular diseases.

由于任何心脏病最终都有可能导致心力衰竭，因此在心血管病诊断和治疗过程中对心脏变力性、变时性和变传导性进行实时监测和评估是非常必要的常规工作。

On the other hand, the simulation shows that the postseismic deformation after 2001 Kunlun M s8.1 earthquake is caused not only by the viscoelastic relaxation but also by poroelastic relaxation. So it is necessary that the viscoelastic relaxation and poroelastic rebound be combinedly considered during process of analysis of postseismic deformation.

通过数值模拟定性讨论了断裂北侧地表形变在震后短期内的调整，对于靠近断裂附近的测点可能是黏弹性松弛和孔隙流体调整共同作用的结果，所以在分析短期震后形变时综合考虑黏弹松弛和孔隙流体调整是很有必要的。

And this difference is not only the result of long-term geological action but also one of the crucial factors of modern geodynamic environment, On the other hand, the simulation shows that the postseismic deformation after 2001 Kunlun M8.1 earthquake is caused not only by the viscoelastic relaxation but also by poroelastic relaxation, So it is necessary that the viscoelastic relaxation and poroelastic rebound be combinedly considered during process of analysis of postseismic deformation.

通过数值模拟定性讨论了断裂北侧地表形变在震后短期内的调整，对于靠近断裂附近的测点可能是黏弹性松弛和孔隙流体调整共同作用的结果，所以在分析短期震后形变时综合考虑黏弹松弛和孔隙流体调整是很有必要的。

I don't think there's any point in pretending that you get to be an expert by meeting your soul mate early on, going through a few meaningful ups and downs, marrying in a cloud of good taste or even in a meteor shower of funk and crunk, and then dying, 50 or 60 years later, having had a faithful and fulfilling love life.

我认为没必要去装作人们好像时要早早地遇到爱情、经历一番爱情波折、笼罩在&品味&迷雾中、甚至在一场&磕磕碰碰&中、然后过了50或60年后，死的时候自己已经度过了一个坚贞、令人满意的爱情生活，那样这才能炼成一位爱情专家。

0 OBR field definitions OBR 字段定义 The daggered items in this segment are not created by the placer known to the filler, not the placer. They are created by the filler and valued as needed when the OBR segment is returned as part of a report. Hence on a new order sent to the filler, they are not valued.

段中加剑号的项不是由执行者认识的下医嘱人传送的，也不是下医嘱者传送的，而是由执行者传送，在 OBR 作为报告的一部分出现时，加剑号的项就是必要的，因此在给执行者传送新医嘱时，此项是空的。

Age of a few comfortable marriage or it is to ever avoided needless worry for marriage hind by brutal female, the choice becomes the operation of Hymen give somebody a new lease on life to the hospital, zhoulong gives birth to a doctor to express, the operation of Hymen give somebody a new lease on life, it is the local organization hook in of a vagina, the mouth decrescent that lets the vagina and become close, of the operation when Cheng needs 20 minutes about, need local anaesthesia.

一些适婚年龄或是曾遭强暴的女性为了婚后避免不必要的困扰，选择到医院做处女膜再造的手术，周龙生医师表示，处女膜再造的手术，是把阴道的局部组织拉拢，让阴道的开口变小及变紧，手术的时程约须20分钟，需要局部麻醉。

Yang Lan says: Love is to have a bit blind actually, want when to marrying, marry, think unripe child gives birth to the child, not necessary those who grind dillydally loiter.

杨澜说：爱情其实是有一点盲目的，想结婚时就结婚，想生孩子就生孩子，没必要磨磨蹭蹭的。

In order to compute accurately the cooling load of subway station air conditioning ,Predicting effectively the infiltration and exfiltration pattern of airflow via opened Platform Screen Doors is necessary.

为了准确计算车站空调冷负荷，有效预测屏蔽门开启时车站站台和隧道间的气流模式是必要的。

The typical FAE model is shown and its simplified conditions in the numerical simulation are provided in the paper.

给出了典型的FAE模型及在数值计算时必要的简化条件。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷