The magnetic lines of force don't exist , they are defined by scientists.
磁力线并不存在，它是由科学家所定义。
It has been suggested that birds can sense the magnetic lines of force stretching from the north to south magnetic poles of the earth, and so direct themselves.
有人认为，鸟类能觉察得出地球自北向南磁极的磁力线，因而能为自己导向。
The existence of electric current in the conductor(not closed)which is cut-ting the magnetic lines of force(B-lines) variably in the magnetic field is pointed out, and the acceleration is discussed.
指出了在磁场中做变速切割磁力线（线）运动的导体（不闭合）中有电流存在，讨论了其运动加速度。
In the presence of a strong magnetic field, the red blood cells form chains that align themselves with the field lines where convoys of red blood cells line up behind a leading cell.
在强磁场的影响下，红细胞会顺着磁场线的方向排列成细胞链，其中会有若干红细胞在领头细胞之后排列成一队。
High in the polar regions, the lines of magnetic force point almost straight upwards.
在极地的高空，磁力线几乎是垂直指向上方。
Focusing magnetic fields on the visual cortex of the brain caused the subjects to see luminous discs and lines.
当把磁场聚焦在大脑的的视觉皮质上时，会促使受试者看见明亮的圆盘和线条。
Maybe they sense slight variations in the rate of change in the magnetic field, much like a hiker reads tightly spaced lines on a topographic map to discern a distinctive canyon.
也许它们感受磁场变化速度的细微变化，就像登山旅行者参照地形图上密密麻麻的线段以辨别一个与众不同的峡谷。
Auroras typically are visible only near Earth's Poles, where magnetic field lines channel charged particles toward the planet.
极光通常只有在靠近地球的南北极才是可见的，在那里磁力线的通道使向着地球的粒子带电。
The most plausible explanation involves electrical currents along the magnetic field lines.
最合理的解释涉及到沿着磁场线的电流。
When a charged particle is in a magnetic field, it tends to travel along that field's lines of force, spiralling as it goes.
当一个带电微粒在磁场中时，它会倾向于沿着磁力线螺旋运动。
Storms brew on the sun when pent-up energy from tangled magnetic field lines is released in the form of light, heat and charged particles.
复杂磁场中的隐藏能源以光、热和带电粒子释放，形成太阳风暴。
Birds, turtles and even bacteria Orient to the earth's magnetic field lines.
鸟、乌龟甚至细菌都是通过地球磁场线来定位的。
This is because it is at the cusp that magnetic field-lines stream down towards the ground, acting as paths for electrons and protons that have slipped past the bow shock.
这是因为磁场线圈是在尖端的地方流向地面的，这些线圈的作用是为那些流失并超越弓形波的电子与质子提供通道。
Immediately after the impact of the interplanetary shock, Earth's magnetic field lines began wobbling at ultra low frequencies.
行星际激波撞击之后，紧接着地球的磁力线开始以特低频摆动。
Because the accretion disk itself is believed to be magnetized, the rotation of the disk can twist the magnetic field lines into a helix.
为我们相信吸积盘本身是被磁化的，圆盘的旋转可将磁力线扭曲成螺旋线圈状。
The instrument should be calibrated in an area free of vibration or stray magnetic fields such as power lines, generators, or welding equipment.
仪器校准应在无振动区域以及无发电机，焊接设备等干扰磁场的区域进行。
In addition the structure of magnetic flux tube is provided also by simultaneous observation of quite a few lines.
除此之外，还可利用多条谱线的同时观测，获得有关磁力线管结构等方面的资料。
Geographical lines do exist where true north and magnetic north are aligned, and these are called agonic lines.
当真北和磁北相吻合的时候，确实存在一些被称为无偏线的地理线。
Electronic currents appear when a conductor cuts magnetic field lines.
导体切割磁场会产生电子流。
I say "relatively" Because charged particles will experience a retarding force if they travel along magnetic field lines that converge.
我说“比较”，是因为当带电粒子沿著逐渐汇聚的磁力线方向运动时，会感受到一股迟滞力。
At the sides of the well the magnetic field lines are quite high and rise steeply above the galactic plane.
在井的四边，磁力线相当高，并急剧地升到银道面以上。
View the magnetic field lines or use a meter to show the direction and magnitude of the current.
观察此长线或利用仪表来显示电流的方向和量级。
The oppositely directed magnetic fields reconnected there, and half of the newly formed field lines shifted rapidly downward, where they stacked up on existing magnetic loops.
方向彼此相反的磁场在此处重连，半数新生成的磁力线迅速向底部移动，堆叠在既有的磁环上面。
Such magnetic disturbances in turn can generate currents in power transmission lines, which act like giant antennas to pick up the disturbances.
这种磁扰在输电线路中产生电流，折叠电流便像巨大天线接收这些磁扰。
These particles, along with radiation, flow rapidly away from the black hole along the magnetic field lines.
这些粒子，伴随着发出射线，沿着磁力线朝着黑洞相反的方向快速流动。
These particles, along with radiation, flow rapidly away from the black hole along the magnetic field lines.
这些粒子，伴随着发出射线，沿着磁力线朝着黑洞相反的方向快速流动。
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