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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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

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