Maps and compasses aren 't likely to disappear anytime soon .
地图和指南针不大可能马上消失。
I 'm ruling out compasses , because while they in some sense receive a magnetic field , its not an electromagnetic field .
我排除了指南针,因为尽管它们在某种意义上接收了一个磁场,它却不是一个电磁场。
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。
Photons provide the electromagnetic force that does everything from pointing compasses north to stopping solid objects collapsing in on themselves .
光子提供了电磁相互作用力,这种力广泛存在,从决定指南针的指向到阻止固体物质因吸引而坍塌。
The quaint habit of printing postcodes on street signs in britain 's major cities is surely unnecessary once we all have maps and compasses on the mobile devices that we carry around with us ?
The boy liked to draw a cicrl with compasses and the girl liked to swim in the swimming pool used in common .
男孩喜欢用圆规画圆,女孩喜欢在共用游泳池游泳。
These compasses were south pointing and were primarily used on land as divination tools and direct finders .
这些罗盘指向南方,主要在陆地上使用,作为占卜工具和方向的寻找。
Highly sensitive compasses are needed for oil discovery , earthquake detection and navigation ( in the catastrophic event of a gps failure , that is ) .
在石油勘探,地震监测以及导航(当gps失效的灾难性事件发生时)中都要用到高敏感罗盘。
Other compasses based on lasers and atoms exist , zibrov says , but those rely on circularly polarized light and other ways to excite the atoms , and require fancy mathematical models to reconstruct the magnetic field after the measurement has been taken .
One of the oldest surviving astrolabes , an instrument for calculating the position of the sun and stars , is on exhibit , as is a set of brass and steel compasses believed to have belonged to michelangelo , another medici beneficiary .