Hyperbolic or parabolic and elliptical in some special relationship between the point
① certain elliptic, hyperbolic or parabolic point of a special relationship. If the focus of the ellipse to the ellipse on the two at any point and the distance is a constant. ② parallel to the light refraction by a lens or curved mirror reflection after the convergence point. ③ something, or sense a focal point for debate interesting ~.
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No. 2
◎ focus jiāodiǎn
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No. 3
The key analogy or argument, concentration points
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No. 4
The focus of debate
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No. 5
辐射线(如光、热、声)会聚或由此发散(或看来好像发散)的一点
No. 6
That after refraction or reflection of light through the intersection. Generally refers to the main focus.
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No. 7
Something, or reasonable striking focal point. Hu "<Chinese Studies Quarterly> Journal of the Declaration issued": "our eyes and focus efforts injection, what only a few Bujing Shu Confucian." Mao Dun "Midnight" 9: "assess his every word Jin Liang, also felt The current negotiations are very difficult. Zhaobo Tao insisted on one, now is the focal point of Wu SunFu concede. "