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A geyser is a vent in Earth's surface that periodically ejects a column of hot water and steam.

间歇泉是地球表面的一个烟囱，周期性的喷出热水和蒸汽。

In this platform, laser sensor is used for absolute location to remove cumulative error from odometer periodically to make a precise and real-time location system.

该平台定期根据激光传感器的绝对定位数据修正里程计的累积误差，从而实现了精度较高、实时性较强的定位系统。

First,the concept of admissibility was given by introducing research background for periodically time-varying descriptor systems.

稳定性是控制系统的一个重要特征，稳定性的研究受到了许多学者的重视。

Although the ancient sects did not survive, aspects of the Gnostic world view have periodically reappeared in many forms: the ancient dualistic religion called Manichaeism and the related medieval heresies of the Albigenses, Bogomils, and Paulicians; the medieval Jewish mystical philosophy known as Cabala; the metaphysical speculation surrounding the alchemy of the Renaissance; 19th-century theosophy; 20th-century existentialism and nihilism; and the writings of the 20th-century Swiss psychologist Carl Jung.

虽然古老的教派没有生存，方面的gnostic的世界观，有定期重新出现在许多形式：古代二元宗教所谓的摩尼教和相关的中世纪的异端邪说的比根斯派，波果米尔人，和paulicians ；中世纪的犹太神秘哲学称为cabala ；形而上的投机周围的炼金术的文艺复兴；十九世纪的theosophy ；二十世纪的存在主义和虚无主义；著作20世纪的瑞士心理学家卡尔容。

In alternating current the motion of the charges is periodically reversed; in direct current it is not.

在交流电中，电荷流动会定时的反向，而在直流电中则不会。

For the case of PV-TW system without window-without heat storage-with/without DC fan-with periodically operating air vents and that with window-with heat storage-without DC fan-with periodically operating air vents, the system"s model is improved and expanded, and then the simulation results are compared with experimental results to validate the new model, while the effect of DC fan and window on system"s performance are further studied.

针对无窗户无蓄热有无直流风机风口按时开关工况和有窗户有蓄热无直流风机风口按时开关工况，对PV-Trombe墙系统模型进行了改进和拓展，并将模拟结果与实验结果对比，验证了改进和拓展后的模型的合理性，并进一步研究了直流风机和窗户对PV-Trombe墙系统性能的影响。

After the transient temperature distribution has reached dynamic equilibrium, because of radius temperature gradient periodically changing with time, the optical path difference between center and edge beam is also periodically changing with time.

当晶体温度达到周期性分布后，由于晶体径向温度梯度的周期性变化，引起通过晶体的平面光波的中心和边缘光线相对光程差也随时间作周期性变化。

In order to understand the relationship between endogenous phytohormones and preharvest fruit drop of apples, contents of IAA and ABA in peduncle, bourse and the tissues around abscission zone of several apple cultivars were periodically analyzed during 8 weeks before harvest, and activity of cellulase in the tissues around abscission zone were periodically analyzed during 20 days before harvest, and ethylene evolution in fruit were analyzed in harvest time.

为了探讨苹果采前落果与内源激素之间的关系，在采前8周间定期测定了不同苹果品种的果柄、果台和离层形成部位组织中IAA、ABA含量；在采收前20d内定期测定了离层部位组织中细胞壁分解酶的活性；在收获期测定了果实乙烯的发生量。

The calculation results show that the temperature of the valve cone changes periodically, leading to thermal stress changes periodically, which is the main reason of the valve cone pit corrosion; the operating temperature of the valve can be reduced by using the higher thermal conductivity materials; at the Same time, 3-D FEM provides a good theoretical basis in the process of the design and improvement for the parts of ICE.

计算结果表明：气门锥面处周期性的温度变化，会导致周期性变化的热应力，是导致气门锥面疲劳点蚀的主要原因；采用较高导热系数的材料可降低气门的工作温度；同时，三维有限元法能为内燃机零部件的进一步设计改进提供很好的理论依据。

One theory holds that the bright star is a massive supergiant, periodically eclipsed by two tight-knit stars inside a swirling, dusty disk. The second theory holds that the bright star is in fact a dying star with a lot less mass, periodically eclipsed by just a single star inside a disk.

这两个理论，一个认为亮主星是颗超巨星，周期性地被一个由尘埃围绕的密近双星系统所掩食；而另一个认为亮主星其实是颗已经流失大量质量的垂死恒星，而尘埃云中的伴星也只有一颗。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了