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| 释义 | 〔Foucault〕French physicist who estimated the speed of light and determined that it travels more slowly in water than in air (1850). He also employed a pendulum to prove the rotation of the earth (1851) and invented the gyroscope (1852).佛科，简·伯纳德·莱昂：(1819-1868) 法国物理学家，1850年测试出光速并确定光在水中的速度慢于在空气中的速度。他还于1851年用钟摆证实了地球的自转，并于1852年发明了回旋器〔day〕The period during which a celestial body makes a similar rotation.天体自转一周的时间：天体做类似自转的一段时间〔west〕The direction opposite to the direction of the earth's axial rotation.西：与地球的绕轴自转方向相反的方向〔geostationary〕Of, relating to, or being a satellite that travels above Earth's equator from west to east at an altitude of approximately 35,900 kilometers (22,300 miles) and at a speed matching that of Earth's rotation, thus remaining stationary in relation to Earth.人造卫星相对地球是静止的：属于、关于或本身是人造同步地球卫星的，该卫星在地球赤道上空约35,900公里（22,300英里）高度上，以与地球自转速度相同的绕地速度自西向东运行，因此似乎停留在同一空间位置上〔east〕The direction of the earth's axial rotation.地球自转的方向〔Copernican〕Of or relating to the theory of Copernicus that the earth rotates daily on its axis and, with the other planets in the solar system, revolves around the sun.哥白尼（学说）的：哥白尼学说或体系的、与之有关的，该学说认为地球每日绕其轴自转，并与太阳系其它行星一起绕太阳公转〔MACHO〕Any of various massive dark objects, such as a brown dwarf star or large planet, in the outermost regions of a galaxy, that may explain the observed anomalous rotation of most galaxies.天体紧密光圈物体：在银河系远程的各种巨大黑色物体，如棕色矮星或大行星，可对观测到的多数银河系不规则自转做出解释〔gyrocompass〕A compass with a motorized gyroscope whose angular momentum interacts with the force produced by the earth's rotation to maintain a north-south orientation of the gyroscopic spin axis, thereby providing a stable directional reference.陀螺罗经：一种装有机动陀螺仪的罗盘，由于陀螺仪的角动量与地球的自转产生的力相互作用，使陀螺转轴一直保持南北方向，从而提供一个稳定的方向指示 |
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