二次曲线 [数] Conic ; quafric curve
二次曲线的直径 [数] diameter of a conic
双二次曲线 [数] biquadratic curve
绝对二次曲面 the absolute quadrie
绝对二次曲线 [数] absolute conic
奇异二次曲面 [数] singular quadric
奇二次曲线 singular conic
二次曲线束 [数] pencil of conics ; bundle of conics
应力二次曲面 surface of tension ; quadric of stress ; stress quadric
回转二次曲面 quafric of revolution ; [数] quadric of revolution
夏鸾翔是晚清较早研究微积分的中算家，据其《致曲术》、《万象一原》，可知他在二次曲线求积问题上得到了比较全面的成果，有的已超过《代微积拾级》，某些成果近似近代的椭圆积分。
This paper discusses Xia's achievements on the integral problem about quadratic curve, some of which were similar to modern elliptic integral and surpassed the level of Dai-wei-ji.
中国女曲在刚刚结束的一场比赛中靠小将李红侠的2个进球，以2：2战平澳大利亚队，凭借2个净胜球的优势排名A组第二，历史上第二次闯入奥运会女曲比赛四强。
The sixth-ranked China squeezed their way into the semifinals of the Olympic women's hockey tournament when they drew 2-2 with three-time Olympic titlists Australia here on Monday.
对置换跳时序列与二次同余跳时序列、三次同余跳时序列、双曲同余跳时序列进行了性能比较。
Secondly, the performance of time-hopping sequences based on permutation-sequences, quadratic congruence sequences, cubic congruence sequences and hyperbolic congruence sequences are compared.
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