The block becomes magnetic when the current is switched on.
一通上电流，这块板就会有磁性。
Astronomers did eventually figure out what sunspots had to do with magnetic fields.
天文学家最终确实发现了太阳黑子与磁场的关系。
Messenger will explore the surface of Mercury, its crust, its atmosphere and even its magnetic field.
“信使号”将探索水星的表面、地壳、大气，甚至其磁场。
Archaeologists also may locate buried remains by using such technologies as ground radar, magnetic-field recording, and metal detectors.
考古学家们还可能利用地面雷达、磁场记录和金属探测器等技术来定位被掩埋的遗骸。
Whereas atmospheric storms arise in a matter of hours and last for days, magnetic tempests develop over decades and persist for centuries.
大气风暴出现在几小时内，持续几天，而磁暴形成要几十年，持续几个世纪。
Western Europeans had also developed and put into use the magnetic compass, which helped when clouds obliterated both the Sun and the stars.
西欧人也已经发明并且使用了磁罗盘，当云彩同时遮住了太阳和星星时，它就能起作用。
This metallic core gives Earth its characteristic magnetic field, which has played an extremely important role in the history of our planet.
这种金属核赋予地球特有的磁场，在地球的历史上发挥了极其重要的作用。
That's because magnetic fields reduce the pressure exerted on the gases inside of them, making the spots cooler than the rest of the Sun's surface.
这是因为磁场降低了施加在内部气体上的压力，使得太阳黑子比太阳表面的其他部分温度更低。
In 1832, the year of Michael Faraday's discovery that a changing magnetic field produces an electric field, a young French engineer patented a new and more efficient waterwheel.
1832年，也就是迈克尔·法拉第发现磁场变化会产生电场的那一年，一位年轻的法国工程师为一种新的、效率更高的水车申请了专利。
The magnetic pull of the city was hard to resist.
都市的强大魅力难以抗拒。
It has a cool magnetic cover now!
拥有超酷的磁性封面！
Sunspots are windows into the sun's magnetic soul.
正如眼睛是心灵之窗，太阳黑子是观测太阳内在磁场活动的窗口。
Unusual wall clock made out of recycled magnetic tape reel.
用回收的磁带卷做成的与众不同的挂钟。
Indeed, he refers to the technology as a magnetic racetrack.
实际上，他将这一技术称作磁赛道。
But we too might have magnetic sensing abilities-in our eyes.
人类也许同样能够感知磁场，感应点就在我们的双眼。
Yet another longstanding mystery is why Mercury has a magnetic field.
另一个悬而未决的谜团是为什么水星上有磁场。
They are fast-spinning stars with extremely powerful magnetic fields.
它们是快速旋转的恒星，其周围有极强的磁场。
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。
The magnetic sense is by far the least-understood sense in the natural world.
到目前为止磁场感应是自然界中人们了解的最少的一种感觉。
The Earth's magnetic field is generated by currents flowing in Earth's outer core.
地球磁场由地球外核中的电流产生。
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。
The sensor successfully detected the weak but regular magnetic pattern of the heartbeat.
传感器成功探测到心跳所伴随的微弱而规则的磁场变化。
The Earth's magnetic field is roughly like that of a bar magnet, with two opposite poles.
地球的磁场大致就像是一块拥有两个磁极的磁铁。
Birds and sea turtles can migrate thousands of miles, by reading the Earth's magnetic cues.
鸟类、海龟通过感知地球磁场，能够迁移数千英里。
A recent study used functional magnetic resonance imaging to see how love affects the brain.
最新一项研究利用机能性磁共振成像技术来观察爱情如何影响大脑。
When this question is answered, even better and cheaper magnetic materials can be developed。
如果这一问题得到解决，就能研制出更好、更便宜的磁性材料。
They sailed as far as America without the aid of magnetic compasses, which was no mean feat.
他们扬帆起航远至美洲，这在当时没有指南针的情况下绝非易事。
They sailed as far as America without the aid of magnetic compasses, which was no mean feat.
他们扬帆起航远至美洲，这在当时没有指南针的情况下绝非易事。
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