... 穿越磁场(cross) 左下角坐标为(X,Y),边长为c。接下来有一行,共有四个整数SX, SY, TX, 两个区域间的边的权值均为1,所以算法复杂度为O(V)。因而整个算法的复杂度为O(NV)。 ...
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当一个带电粒子快速穿越云室时,水汽会凝结形成一串小液滴,这样便标识出了该粒子的路径;若将容器置于一个磁场中,还能知道粒子所带电荷的性质。
When a charged particle zips through the chamber, the vapour condenses into a trail of droplets showing the particle's path and, if the box is placed in a magnetic field, its electrical charge.
就像试图穿越海浪的船,诱发的磁场积蓄在太阳风与金星的电离层的交汇处。
Like a boat trying to cut through the ocean waves, the induced magnetic fields pile up where the solar wind meets Venus's ionosphere.
如果物体穿越静电场,它会觉得有一部份的场是磁场。
If the object moves through a static electric field, it perceives the field as partially magnetic.
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