During the development of the limb, Sonic hedgehog ( SHH) protein plays a key role as a mediator of the zone of polarizing activity ( ZPA).

Seasonal variations of time determination of zat, zpa, and Za at Shanghai Observatory

上海天文台ZAT、ZPA、ZA三架仪器测时结果的季节性变化

Exotic pollution load analysis of south-west zone in Wuhan East Lake Research on the Current Situation of Pollution Sources and Its Countermeasure in ZPC

武汉东湖西南区外源污染调查与评价中原石化污染源现状调查及对策研究

Results There was little difference between the antibacterial ZPC and the common ZPC.

结果大体观察显示，抗菌磷酸锌黏固剂与普通磷酸锌黏固剂无明显差异。

A preliminary study on the zero point of charge ( zpc) of some soil colloids

几种土壤胶体电荷零点（ZPC）的初步研究

Research on the Current Situation of Pollution Sources and Its Countermeasure in ZPC

中原石化污染源现状调查及对策研究

Humans United Against Robots ( HUAR) and the Zombie Preparedness Initiative ( ZPI) build on these irrational fears, supplying information and networking for believers and jokers alike.

人类反机器人联盟（简称HUAR）和防备僵尸倡议组织（简称ZPI）都是基于这些无端的恐惧而建立的。他们为信奉者以及那些找乐之徒提供相关信息和组织网络。

ZPI focuses on providing a forum for survival techniques and advice on everything from how to find clean water, to how to skin a moose.

ZPI将重点放在建设论坛上面，设立平台供大家分享各种生存技巧和建议，从如何寻找清洁水源到如何剥驼鹿皮。

Hurricanes, tornadoes, snowstorms, ice storms and electrical storms are all examples of extreme weather that may challenge an entire community.

飓风、龙卷风、雪暴、冰暴和雷暴，都是可能威胁到整个社会的极端的气候现象。

Forecasters expected the storm to dump as much as10 feet of snow in the Sierra Nevada, where a blizzard warning was downgraded Friday evening to a winter storm warning.

预报员预测，暴风雨将使内华达山脉的积雪堆积到雪暴警报暴风雪警报10英尺，虽然那里的雪暴警报在周五晚上已经降级为暴风雪警报。

Bigger worms tend to live longer because they can dig deeper, and avoid temperature extremes, soils that are too wet or dry, snow and predators.

较大的蚯蚓会活得较久，因为它们能钻得深一些，避免了温度忽高忽低、土壤过湿或过干，也避免了雪暴和食肉动物（的伤害）。

Areas of the composition seem deliberately blurred, as our vision would be in trying to gaze through a snowstorm.

画面各区域仿佛被有意模糊，画面如同摄取于雪暴之中。

They grow well in heavy clay soils, and they can survive ice storms well.

他们在大量的泥土地中生长旺盛，而且他们在雪暴中也能生存。

Weather The Climatic Character of Snowstorm in Xinjiang

新疆雪暴天气的气候特征

These blizzards and long spells of extreme cold are very hard on any wildlife that isn't hibernating.

这些雪暴以及长期的严寒对于不冬眠的野生动物是极为严酷的。

At first, it looked as if Otzi had frozen to death in a snowstorm in the Alps.

初看起来奥兹似乎冻死于阿尔卑斯山的雪暴。

Winter storms can be dangerous.

雪暴是危险的。

The Climatic Character of Snowstorm in Xinjiang The duration of snowstorm is within 2.5 hours.

新疆雪暴持续时间绝大多数在2.5h之内。

One hundred years ago, the formula of force on a charge in electromagnetic field was established by Lorentz in the case of a charge at lower speed. That formula was extended for charge at any speed afterwards.

百年以前，由洛伦兹建立的电磁场对电荷的作用力公式－洛伦兹力公式，是在低速情况下得到的，后来被推广到了任意运动速度。

A condition of Coulomb's law is discussed and a general method by applying Coulomb's law to finding the electrical force acting on point charge in the material is proposed.

库仑定律中的真空条件不是必需的成立条件，应用库仑定律也可以求解有介质存在时点电荷所受作用力。

Research on the electric field force acting on a point charge in electric medium

介质中点电荷所受电场力的研究