五角大楼的导弹防御局正阿拉斯加建造6枚截导弹，并在加利福尼亚范登堡空军基地投入4枚。
The Pentagon’sMissile Defense Agency is currently installing six interceptor missilesat Fort Greely in Alaska, and four at Vandenberg Air Force Base inCalifornia.
当时天降大雨，这架飞机正第二次尝试降落，在此过程中它突然下落并滑出跑道，最终断成两截。
The plane was making a second attempt at landing when it went down in heavy rains, skidded off the runway and broke in two.
提出一种将辅助平面旋转某个特定的角度图解正椭圆锥面截交线的方法。
The paper presents the graphic method of solution of the intersection of right elliptic cone with plane by rotation of auxiliary planes at a certain Angle.
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