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1.the highest region of the ionosphere (from 90 to 600 miles up) that contains the highest concentration of free electrons and is most useful for long-range radio transmission.
电离层的最高层，距地球表面至英里，有高度密集的自由电子，对远距离无线电传输非常有用。收藏指正
2.These machines are useful for mixing and injecting a wide range of solid fertilizers in addition to gypsum.
这些机器可用于混合并向灌溉系统注入包括石膏在内的许多溶解度低的固体肥料。收藏指正
3.This is a very useful technique that allows you to concentrate on your tonal range without being distracted by color.
这是一种非常实用的技术，它可以让你专注于灰调层次的把握而不用受色彩的干扰。收藏指正
4.Its monthly magazine, Choice, regularly publishes findings of comparative product tests and service surveys providing useful and practical information, advice and viewpoints on a wide range of consumer issues and concerns.
消委会定期出版《选择》月刊，发表产品测试及调查研究结果，令消费者获得实用的资讯。收藏指正
5.Therefore, we must cherish the current study time by studying wide range of knowledge and skills which might be a useful tool for our future life.
因此，我们必须珍惜现在的学习时间，学习各种各样的知识、技能，这将会成为以后生活中的一个有利工具。收藏指正
6.In addition, 13 species recovered from the Dawangou section are restricted to the Caradoc—Ashgill, and have a wide geographical range making them useful biostratigraphical taxa.
该组合中有13个种仅分布于“Caradoc”—“Ashgill”期,地理分布广泛,因而颇具生物地层学潜力。收藏指正
7.The membrane of AgCl/Si_3N_4 is a useful membrane that can be app-lied to making the ionic sensitive electrode, this electrode can beused to determine Ag~+ ion or Cl~- ion concentration of the solution,range from 10~(-2)--10~(-5) M, but using it to determine Ag~+ ion concentr-ation is not very satisfaying.
AgCl/Si_3N_4膜可用来制作离子敏感电极,测量溶液中的Ag~+和Cl~-离子的浓度,测量范围在10~(-2)～10~(-5)M,但对Ag~+离子浓度的测量结果不够理想。收藏指正
8.Range estimates from the foretop would not have been very useful at that time, especially given the decimated gun crews and difficulties relaying data. (Flags were probably used from the foretop to the gun).
这种测距方式并不精准，特别是在船身剧烈摇晃或者是火炮烟硝阻碍观测视线的时候。）收藏指正
9.The ISSA core curriculum for Personal Trainers covers the broadest range of useful topics including anatomy, physiology, kinesiology, nutrition, supplementation, personalized diet and exercise programming, flexibility techniques, and sports medicine for the fitness professional.
ISSA给教练提供最广泛和实用的私教课程，其中包括解剖学、生理学、运动机能学、营养学、营养补充、个人膳食和训练计划、柔韧技能和体育医学等相关内容。收藏指正
10.Conclusion Knowledge of the normal range about the position of the lower end of the conus medullaris and the dural sac is very useful in diagnosing tethered spinal cord syndrome and in locating lumbar puncture site.
结论　熟悉脊髓圆锥和硬膜囊下端位置的正常范围 ,能帮助临床诊断脊髓栓系综合征等疾病及腰椎穿刺定位。收藏指正
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