The cathode of the gun may be partially shielded magnetically. The paraxial-ray equation for describing the electron trajectory in the accelerating region is solved in closed form.
阴极处磁场可以具有任意屏蔽程度，得到了在加速场内描写电子轨迹的傍轴方程的解析解。
Experts warn burgeoning populations, climate change are accelerating desertification in region.
专家警告说迅速增长的人口、气候变化将加速地区沙漠化。
Shantayanan Devarajan, World Bank Chief Economist for the region and co-author of the report, says growth rates in South Asia have been accelerating in the last 10 to 15 years.
世界银行负责该地区业务的主任经济师和本报告的合著者Shantayanan Devarajan说，南亚地区的增长率在过去10至15年中不断提高。
The BRIC dental biomaterial market is extremely underpenetrated and will exhibit very strong growth over the forecast period due to accelerating adoption of dental implant procedures in the region.
金砖四国的牙科生技材料市场穿透不足，今后由于在该地区的人工植牙治疗引进的加速作用，预期将有大幅成长。
From the regional perspective, the Yangtze River Delta region of the power shortage, the Shanghai, Jiangsu, Zhejiang and other places, construction of the power industry is accelerating.
从地域看，长三角地区的电力紧张，因此上海、江苏、浙江等地的电力行业建设正在加速。
Productivity in the region has doubled in the past decade and is accelerating faster than anywhere else, the report said.
生产力促进在该地区增加了一倍，在过去十年中，并正加快速度比任何其他地方，该报告称。
Productivity in the region has doubled in the past decade and is accelerating faster than anywhere else, the report said.
生产力促进在该地区增加了一倍，在过去十年中，并正加快速度比任何其他地方，该报告称。
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