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。

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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。

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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。

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This played an important role in accelerating the region's rate of economic growth to an average of 5.5% from mid-2003 to mid-2008.

ECONOMIST: Latin American geopolitics

As a result, one other thing should be frighteningly clear: We are having our policies towards Egypt's succession - and the tsunami it is accelerating elsewhere in the region influenced, shaped and probably subverted by the Muslim Brotherhood's American operatives.

CENTERFORSECURITYPOLICY: The Muslim Brotherhood: the enemy in its own words

Prices of non-landed private homes outside Singapore's central region rose 3.4% in the fourth quarter from the previous quarter, accelerating from a 1.0% rise in the third quarter.

WSJ: Singapore Residential Property Prices Rise