focus foci 重点
Laser scalpel excision without epileptogenic focus is a craniotomy, resection of the epileptic foci can reach a new advanced treatment technology.
利用激光手术刀切除致痫灶是一种不用开颅，可以达到切除致痫灶的新的先进治疗技术。
The flatter the ellipse the farther apart the foci and the farther each focus the center.
椭圆越扁平，两焦点之间的距离越远，每个焦点离中心的距离也越远。
The basic idea is to select a set of objects as foci. And the central focus, the basic vectors and FAC-coordinates can be got by computing.
基本思想是在对象空间选出焦点集，通过计算得到中心焦点、基本向量集和FAC _坐标。
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